CVE-2026-62911: Microsoft Exchange Server Elevation of Privilege Vulnerability
Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
CSIRTS triage
- What
- An authentication bypass vulnerability via capture-replay in Microsoft Exchange Server allows an authorized attacker to escalate privileges over a network.
- Who is affected
- Authorized users or network-adjacent attackers targeting Exchange Server deployments.
- Urgency
- High priority; CVSS 8.0 indicates severe risk and network-accessible attack surface, though not currently exploited.
- Action
- Apply Microsoft security updates for Exchange Server when available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62911
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-2026-629110.72% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-62911 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[NEW] [high] Microsoft Exchange Server: Multiple vulnerabilitiescert-bund
- unknownNCSC-2026-0289 [1.00] [M/H] Vulnerabilities fixed in Microsoft Exchange Serverncsc-nl
- unknownMultiple vulnerabilities in Microsoft products (August 12, 2026)cert-fr-avis
- highCVE-2026-62911: Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized atta…nvd
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