CVE-2026-55005
An attacker can exploit multiple vulnerabilities in Microsoft Exchange to execute arbitrary code, gain elevated permissions, or conduct spoofing attacks.
CSIRTS triage
- What
- Multiple vulnerabilities in Microsoft Exchange can be exploited to execute arbitrary code and gain elevated permissions.
- Who is affected
- All deployments of Microsoft Exchange are affected.
- Urgency
- Remediation is high priority due to the potential for exploitation.
- Action
- Install the latest security patches for Microsoft Exchange.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.66% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 48% of all EPSS-scored CVEs.
Advisory coverage (4)
- high[NEW] [high] Microsoft Exchange: Multiple vulnerabilitiescert-bund · 2026-07-15
- unknownNCSC-2026-0234 [1.00] [M/H] Vulnerabilities fixed in Microsoft Exchangencsc-nl · 2026-07-14
- highCVE-2026-55005: Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execu…nvd · 2026-07-14
- highCVE-2026-55005: Microsoft Exchange Server Remote Code Execution Vulnerabilitymsrc · 2026-07-14
External references
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[](https://www.csirts.com/cve/CVE-2026-55005)