CVE-2026-83611: xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content

unknownCVE-2026-83611

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-09-08
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83611

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-836110.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-83611	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for xmldom

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highGHSA-c7q8-3ch8-vqpv: xmldom: Processing Instruction Target Injection Bypasses requireWellFormedghsa · 2026-09-08
highGHSA-jxjr-3g7g-3944: xmldom: requireWellFormed element/attribute name validation is bypassable via an embedded…ghsa · 2026-09-08
highGHSA-27p8-2357-5qqv: xmldom: DocType `name` Injection Bypasses requireWellFormedghsa · 2026-09-08
highGHSA-3px3-54cx-rmw9: xmldom: Creation-time XML Name/QName validation is bypassable via an embedded line termin…ghsa · 2026-09-08
highGHSA-vr34-hp96-76pp: xmldom: requireWellFormed DocType publicId/systemId validation is bypassable via an embed…ghsa · 2026-09-08
mediumGHSA-6h8r-xr42-gp59: xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a lin…ghsa · 2026-09-08