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CVE-2026-69558: Microsoft Partner Center Information Disclosure Vulnerability

highCVSS 8.6CVE-2026-69558
Authorization bypass through user-controlled key in Microsoft Partner Center allows an unauthorized attacker to disclose information over a network.

CSIRTS triage

vendor: Microsoftproduct: Partner CenterAuthentication bypassInformation disclosure
What
Authorization bypass through user-controlled key allows unauthorized attackers to disclose information.
Who is affected
All deployments of Microsoft Partner Center are affected.
Urgency
High severity (CVSS 8.6) and not yet exploited, but authorization bypass is a critical attack vector requiring prompt patching.
Action
Apply the latest security update from Microsoft for Partner Center immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 8.6
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69558

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-69558coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Microsoft Partner Center

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.

More from Microsoft Security Response Center