{ "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": "Microsoft heeft kwetsbaarheden verholpen in Exchange Server.", "title": "Feiten" }, { "category": "description", "text": "Een kwaadwillende kan de kwetsbaarheden misbruiken om een Denial-of-Service uit te voeren, zich voor te doen als andere gebruiker, zich verhoogde rechten toe te kennen, willekeurige code uit te voeren en/of toegang te krijgen tot gevoelige gegevens.\n\nVoor succesvol misbruik moet de kwaadwillende wel over voorafgaande authenticatie beschikken.", "title": "Interpretaties" }, { "category": "description", "text": "Microsoft heeft updates beschikbaar gesteld waarmee de beschreven kwetsbaarheden worden verholpen. We raden u aan om deze updates te installeren. Meer informatie over de kwetsbaarheden, de installatie van de updates en eventuele work-arounds vindt u op:\n\nhttps://portal.msrc.microsoft.com/en-us/security-guidance", "title": "Oplossingen" }, { "category": "general", "text": "medium", "title": "Kans" }, { "category": "general", "text": "high", "title": "Schade" }, { "category": "general", "text": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "title": "CWE-79" }, { "category": "general", "text": "Improper Control of Resource Identifiers ('Resource Injection')", "title": "CWE-99" }, { "category": "general", "text": "Heap-based Buffer Overflow", "title": "CWE-122" }, { "category": "general", "text": "Authentication Bypass by Capture-replay", "title": "CWE-294" }, { "category": "general", "text": "Deserialization of Untrusted Data", "title": "CWE-502" }, { "category": "general", "text": "Missing Authorization", "title": "CWE-862" }, { "category": "general", "text": "Server-Side Request Forgery (SSRF)", "title": "CWE-918" } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "Nationaal Cyber Security Centrum", "namespace": "https://www.ncsc.nl/" }, "title": "Kwetsbaarheden verholpen in Microsoft Exchange server", "tracking": { "current_release_date": "2026-08-12T05:43:34.222813Z", "generator": { "date": "2025-08-04T16:30:00Z", "engine": { "name": "V.A.", "version": "1.3" } }, "id": "NCSC-2026-0289", "initial_release_date": "2026-08-12T05:43:34.222813Z", "revision_history": [ { "date": "2026-08-12T05:43:34.222813Z", "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": "Microsoft Exchange Server 2016 Cumulative Update 23" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-2" } } ], "category": "product_name", "name": "Microsoft Exchange Server 2019 Cumulative Update 14" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-3" } } ], "category": "product_name", "name": "Microsoft Exchange Server 2019 Cumulative Update 15" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-4" } } ], "category": "product_name", "name": "Microsoft Exchange Server Subscription Edition RTM" } ], "category": "vendor", "name": "Microsoft" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-62910", "cwe": { "id": "CWE-99", "name": "Improper Control of Resource Identifiers ('Resource Injection')" }, "notes": [ { "category": "other", "text": "Improper Control of Resource Identifiers ('Resource Injection')", "title": "CWE-99" }, { "category": "description", "text": "Improper control of resource identifiers in Microsoft Exchange Server enables an authorized attacker to elevate privileges over a network, posing significant security risks.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] }, "references": [ { "category": "self", "summary": "CVE-2026-62910 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-62910.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.2, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] } ], "title": "CVE-2026-62910" }, { "cve": "CVE-2026-62912", "cwe": { "id": "CWE-502", "name": "Deserialization of Untrusted Data" }, "notes": [ { "category": "other", "text": "Deserialization of Untrusted Data", "title": "CWE-502" }, { "category": "description", "text": "A deserialization vulnerability in Microsoft Exchange Server allows an authorized attacker to cause a denial of service over a network by processing untrusted data.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] }, "references": [ { "category": "self", "summary": "CVE-2026-62912 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-62912.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] } ], "title": "CVE-2026-62912" }, { "cve": "CVE-2026-62913", "cwe": { "id": "CWE-122", "name": "Heap-based Buffer Overflow" }, "notes": [ { "category": "other", "text": "Heap-based Buffer Overflow", "title": "CWE-122" }, { "category": "description", "text": "A heap-based buffer overflow vulnerability in Microsoft Exchange Server enables an authorized attacker to execute arbitrary code remotely over a network.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] }, "references": [ { "category": "self", "summary": "CVE-2026-62913 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-62913.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] } ], "title": "CVE-2026-62913" }, { "cve": "CVE-2026-62914", "cwe": { "id": "CWE-79", "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')" }, "notes": [ { "category": "other", "text": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "title": "CWE-79" }, { "category": "description", "text": "A vulnerability in Microsoft Exchange Server involving improper input neutralization during web page generation allows an authorized attacker to perform network spoofing.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] }, "references": [ { "category": "self", "summary": "CVE-2026-62914 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-62914.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N", "baseScore": 7.3, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] } ], "title": "CVE-2026-62914" }, { "cve": "CVE-2026-62915", "cwe": { "id": "CWE-862", "name": "Missing Authorization" }, "notes": [ { "category": "other", "text": "Missing Authorization", "title": "CWE-862" }, { "category": "description", "text": "A missing authorization vulnerability in Microsoft Exchange Server enables an authorized attacker to bypass a security feature over a network, potentially compromising system integrity.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] }, "references": [ { "category": "self", "summary": "CVE-2026-62915 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-62915.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] } ], "title": "CVE-2026-62915" }, { "cve": "CVE-2026-65813", "cwe": { "id": "CWE-918", "name": "Server-Side Request Forgery (SSRF)" }, "notes": [ { "category": "other", "text": "Server-Side Request Forgery (SSRF)", "title": "CWE-918" }, { "category": "description", "text": "A server-side request forgery (SSRF) vulnerability in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network, potentially compromising system security.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] }, "references": [ { "category": "self", "summary": "CVE-2026-65813 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-65813.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C", "baseScore": 6.5, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] } ], "title": "CVE-2026-65813" }, { "cve": "CVE-2026-62911", "cwe": { "id": "CWE-294", "name": "Authentication Bypass by Capture-replay" }, "notes": [ { "category": "other", "text": "Authentication Bypass by Capture-replay", "title": "CWE-294" }, { "category": "description", "text": "An authentication bypass vulnerability via capture-replay in Microsoft Exchange Server enables an authorized attacker to elevate privileges over a network.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] }, "references": [ { "category": "self", "summary": "CVE-2026-62911 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-62911.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.0, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4" ] } ], "title": "CVE-2026-62911" } ] }