{ "document": { "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "nl", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." }, { "category": "description", "text": "Zabbix SIA heeft meerdere kwetsbaarheden verholpen in Zabbix, inclusief de API, Frontend, script item en preprocessing componenten, en de Windows Agent installer.", "title": "Feiten" }, { "category": "description", "text": "De kwetsbaarheden betreffen verschillende onderdelen van Zabbix.\n- Een probleem in het login lockout mechanisme zorgt ervoor dat meerdere gelijktijdige mislukte inlogpogingen niet correct worden geteld, waardoor een aanvaller de lockout kan omzeilen en meer wachtwoordpogingen kan doen dan bedoeld.\n- In de OAuth-configuratie voor e-mailmedia kan een Super Admin via aanpassingen aan de 'Token endpoint' het client secret onthullen en wijzigen.\n- Prototype pollution in de searchParamsToObject() functie leidt tot persistente cross-site scripting (XSS) via onveilige URL-parameterverwerking en jQuery elementcreatie.\n- De Frontend webserver bevat een actie (popup.testtriggerexpr) die door niet-geauthenticeerde gebruikers kan worden misbruikt om een denial of service (DoS) te veroorzaken door overmatige CPU-belasting.\n- Geauthenticeerde gebruikers kunnen via de validate.api.exists actie plaintext user macro waarden uitlezen, wat gevoelige informatie blootlegt. In Zabbix 7.4 is een cryptografische sleutel voor het ondertekenen van Frontend sessies onjuist opgeslagen in de database seed, waardoor sessiecookies kunnen worden vervalst bij gebruik van SAML authenticatie en gastgebruikers. De validate.api.exists actie kan ook leiden tot DoS door excessief CPU-gebruik bij speciaal samengestelde verzoeken.\n- In de script item en preprocessing JavaScript HttpRequest logica kan een administrator geheugen buiten de bedoelde grenzen uitlezen, wat kan leiden tot informatielekken.\n- De API host.get actie maakt het mogelijk voor geauthenticeerde gebruikers om de pre-shared key (PSK) van een host te achterhalen, wat de vertrouwelijkheid en integriteit van gegevens ondermijnt.\n- Een authenticeerde administrator kan via speciaal samengestelde JavaScript scripts in preprocessing of script items een DoS veroorzaken door server- of proxycrashes, specifiek in community packages voor Fedora en EPEL.\n- De Windows Agent installer detecteert nu onveilige installatiepaden die kwetsbaar zijn voor DLL sideloading en vraagt expliciete bevestiging van de gebruiker voordat de installatie doorgaat.", "title": "Interpretaties" }, { "category": "description", "text": "Zabbix SIA heeft updates uitgebracht om deze kwetsbaarheden in Zabbix te verhelpen. Zie bijgevoegde referenties voor meer informatie.", "title": "Oplossingen" }, { "category": "general", "text": "medium", "title": "Kans" }, { "category": "general", "text": "high", "title": "Schade" }, { "category": "general", "text": "Out-of-bounds Read", "title": "CWE-125" }, { "category": "general", "text": "Observable Discrepancy", "title": "CWE-203" }, { "category": "general", "text": "Uncaught Exception", "title": "CWE-248" }, { "category": "general", "text": "Use of Hard-coded Password", "title": "CWE-259" }, { "category": "general", "text": "Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')", "title": "CWE-362" }, { "category": "general", "text": "Asymmetric Resource Consumption (Amplification)", "title": "CWE-405" }, { "category": "general", "text": "Uncontrolled Search Path Element", "title": "CWE-427" }, { "category": "general", "text": "Insufficiently Protected Credentials", "title": "CWE-522" }, { "category": "general", "text": "Allocation of Resources Without Limits or Throttling", "title": "CWE-770" }, { "category": "general", "text": "Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')", "title": "CWE-1321" } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "Nationaal Cyber Security Centrum", "namespace": "https://www.ncsc.nl/" }, "references": [ { "category": "external", "summary": "Reference", "url": "https://support.zabbix.com/browse/ZBX-28067" }, { "category": "external", "summary": "Reference", "url": "https://support.zabbix.com/browse/ZBX-28068" }, { "category": "external", "summary": "Reference", "url": "https://support.zabbix.com/browse/ZBX-28069" }, { "category": "external", "summary": "Reference", "url": "https://support.zabbix.com/browse/ZBX-28070" }, { "category": "external", "summary": "Reference", "url": "https://support.zabbix.com/browse/ZBX-28071" }, { "category": "external", "summary": "Reference", "url": "https://support.zabbix.com/browse/ZBX-28072" }, { "category": "external", "summary": "Reference", "url": "https://support.zabbix.com/browse/ZBX-28073" }, { "category": "external", "summary": "Reference", "url": "https://support.zabbix.com/browse/ZBX-28074" }, { "category": "external", "summary": "Reference", "url": "https://support.zabbix.com/browse/ZBX-28075" }, { "category": "external", "summary": "Reference", "url": "https://support.zabbix.com/browse/ZBX-28076" }, { "category": "external", "summary": "Reference", "url": "https://support.zabbix.com/browse/ZBX-28077" } ], "title": "Kwetsbaarheden verholpen in Zabbix", "tracking": { "current_release_date": "2026-08-20T08:47:27.822813Z", "generator": { "date": "2025-08-04T16:30:00Z", "engine": { "name": "V.A.", "version": "1.3" } }, "id": "NCSC-2026-0320", "initial_release_date": "2026-08-20T08:47:27.822813Z", "revision_history": [ { "date": "2026-08-20T08:47:27.822813Z", "number": "1.0.0", "summary": "Initiele versie" } ], "status": "final", "version": "1.0.0" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-1" } } ], "category": "product_name", "name": "Zabbix" } ], "category": "vendor", "name": "Zabbix" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-1199", "cwe": { "id": "CWE-362", "name": "Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')" }, "notes": [ { "category": "other", "text": "Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')", "title": "CWE-362" }, { "category": "description", "text": "The Zabbix API and Frontend login lockout mechanism contains a vulnerability where simultaneous failed login attempts are not properly counted, allowing attackers to potentially exceed intended password guess limits.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-1199 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-1199.json" } ], "title": "CVE-2026-1199" }, { "cve": "CVE-2026-23922", "cwe": { "id": "CWE-522", "name": "Insufficiently Protected Credentials" }, "notes": [ { "category": "other", "text": "Insufficiently Protected Credentials", "title": "CWE-522" }, { "category": "description", "text": "The email media OAuth 'Client secret' field is hidden after saving but can be exposed and reset by a Super Admin through manipulation of the 'Token endpoint'.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-23922 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-23922.json" } ], "title": "CVE-2026-23922" }, { "cve": "CVE-2026-23929", "cwe": { "id": "CWE-1321", "name": "Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')" }, "notes": [ { "category": "other", "text": "Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')", "title": "CWE-1321" }, { "category": "description", "text": "A prototype pollution vulnerability in searchParamsToObject() leads to persistent XSS in Maps by unsafe URL parameter handling combined with jQuery's unsafe element creation accessing the prototype chain.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-23929 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-23929.json" } ], "title": "CVE-2026-23929" }, { "cve": "CVE-2026-23930", "cwe": { "id": "CWE-405", "name": "Asymmetric Resource Consumption (Amplification)" }, "notes": [ { "category": "other", "text": "Asymmetric Resource Consumption (Amplification)", "title": "CWE-405" }, { "category": "description", "text": "An unauthenticated attacker can cause a denial of service by sending specially crafted requests to the Frontend popup.testtriggerexpr action, resulting in excessive CPU load on the Frontend webserver.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-23930 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-23930.json" } ], "title": "CVE-2026-23930" }, { "cve": "CVE-2026-23931", "cwe": { "id": "CWE-203", "name": "Observable Discrepancy" }, "notes": [ { "category": "other", "text": "Observable Discrepancy", "title": "CWE-203" }, { "category": "description", "text": "A vulnerability in the frontend validate.api.exists action permits authenticated users to access plaintext user macro values, potentially compromising data confidentiality.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-23931 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-23931.json" } ], "title": "CVE-2026-23931" }, { "cve": "CVE-2026-23933", "cwe": { "id": "CWE-259", "name": "Use of Hard-coded Password" }, "notes": [ { "category": "other", "text": "Use of Hard-coded Password", "title": "CWE-259" }, { "category": "description", "text": "Zabbix 7.4 contains a vulnerability where a cryptographic key for signing Frontend sessions is stored in the database seed, enabling attackers to forge session cookies and gain unauthorized access in deployments using both SAML authentication and guest users.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-23933 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-23933.json" } ], "title": "CVE-2026-23933" }, { "cve": "CVE-2026-23934", "cwe": { "id": "CWE-405", "name": "Asymmetric Resource Consumption (Amplification)" }, "notes": [ { "category": "other", "text": "Asymmetric Resource Consumption (Amplification)", "title": "CWE-405" }, { "category": "description", "text": "An authenticated user can cause excessive CPU usage on the Frontend webserver by sending specially crafted requests to the validate.api.exists action, potentially leading to a denial of service condition.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-23934 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-23934.json" } ], "title": "CVE-2026-23934" }, { "cve": "CVE-2026-23935", "cwe": { "id": "CWE-125", "name": "Out-of-bounds Read" }, "notes": [ { "category": "other", "text": "Out-of-bounds Read", "title": "CWE-125" }, { "category": "description", "text": "A vulnerability in Zabbix's script item and preprocessing JavaScript HttpRequest logic enables an administrator to read out-of-bounds memory, risking confidentiality loss.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-23935 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-23935.json" } ], "title": "CVE-2026-23935" }, { "cve": "CVE-2026-23937", "cwe": { "id": "CWE-203", "name": "Observable Discrepancy" }, "notes": [ { "category": "other", "text": "Observable Discrepancy", "title": "CWE-203" }, { "category": "description", "text": "The Zabbix API host.get action contains a vulnerability that permits authenticated users to extract a host's pre-shared key (PSK), potentially compromising data integrity within affected environments.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-23937 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-23937.json" } ], "title": "CVE-2026-23937" }, { "cve": "CVE-2026-23938", "cwe": { "id": "CWE-248", "name": "Uncaught Exception" }, "notes": [ { "category": "other", "text": "Uncaught Exception", "title": "CWE-248" }, { "category": "other", "text": "Allocation of Resources Without Limits or Throttling", "title": "CWE-770" }, { "category": "description", "text": "An authenticated administrator can cause a denial of service by crashing the Zabbix server or proxy using specially crafted JavaScript scripts in preprocessing or script items, affecting community packages in Fedora and EPEL.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-23938 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-23938.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L", "baseScore": 2.7, "baseSeverity": "LOW" }, "products": [ "CSAFPID-1" ] } ], "title": "CVE-2026-23938" }, { "cve": "CVE-2026-59781", "cwe": { "id": "CWE-427", "name": "Uncontrolled Search Path Element" }, "notes": [ { "category": "other", "text": "Uncontrolled Search Path Element", "title": "CWE-427" }, { "category": "description", "text": "The Zabbix Agent installer for Windows now detects insecure installation directories to prevent DLL sideloading attacks, requiring explicit user confirmation before proceeding in such locations.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-59781 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-59781.json" } ], "title": "CVE-2026-59781" } ] }