CVE-2026-62912: Microsoft Exchange Server Denial of Service Vulnerability
Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to deny service over a network.
CSIRTS triage
- What
- Deserialization of untrusted data in Microsoft Exchange Server allows denial of service by authorized attackers.
- Who is affected
- Microsoft Exchange Server deployments accessible to authenticated users.
- Urgency
- Medium severity (CVSS 6.5); not exploited but authorized DoS attack vector warrants timely patching.
- Action
- Update Microsoft Exchange Server to the patched version.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch Microsoft Exchange Server
Get an email when a new Microsoft Exchange Server advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62912
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.
- Moderate exploitation riskCVE-2026-629121.3% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 68% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-62912 | 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
- mediumCVE-2026-62912: Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker t…nvd
Recent advisories for Microsoft Exchange Server
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.
- high[NEW] [high] Microsoft Exchange Server: Multiple vulnerabilitiescert-bund · 2026-08-12
- unknownNCSC-2026-0289 [1.00] [M/H] Vulnerabilities fixed in Microsoft Exchange Serverncsc-nl · 2026-08-12
- mediumCVE-2026-65813: Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker …nvd · 2026-08-11
- mediumCVE-2026-62915: Missing authorization in Microsoft Exchange Server allows an authorized attacker to bypass a s…nvd · 2026-08-11
- highCVE-2026-62914: Improper neutralization of input during web page generation ('cross-site scripting') in Micros…nvd · 2026-08-11
- highCVE-2026-62913: Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execu…nvd · 2026-08-11
More from Microsoft Security Response Center
- highCVE-2026-70130: Microsoft Office Remote Code Execution Vulnerability2026-08-11
- highCVE-2026-70354: .NET Core Remote Code Execution Vulnerability2026-08-11
- highCVE-2026-68792: Microsoft Office Elevation of Privilege Vulnerability2026-08-11
- highCVE-2026-66807: Microsoft Office Graphics Component Remote Code Execution Vulnerability2026-08-11
- highCVE-2026-64909: Microsoft Office Remote Code Execution Vulnerability2026-08-11