CVE-2026-55026
Actively exploited. CVE-2026-55026 is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
An attacker can exploit multiple vulnerabilities in various Microsoft Office products to execute arbitrary code, disclose information, present false information, escalate privileges, and bypass security measures.
CSIRTS triage
- What
- Multiple vulnerabilities in various Microsoft Office products can be exploited to execute arbitrary code, disclose information, present false information, escalate privileges, and bypass security measures.
- Who is affected
- Users of Microsoft Office products are affected by these vulnerabilities.
- Urgency
- Remediation is critical due to the high severity and potential for exploitation of these vulnerabilities.
- Action
- Users should update their Microsoft Office products to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 34% of all EPSS-scored CVEs.
Advisory coverage (8)
- critical[NEW] [critical] Microsoft Office products: Multiple vulnerabilitiescert-bund · 2026-07-23
- unknownexploitedNCSC-2026-0237 [1.02] [H/H] Vulnerabilities Fixed in Microsoft Officencsc-nl · 2026-07-21
- unknownexploitedNCSC-2026-0237 [1.01] [H/H] Vulnerabilities fixed in Microsoft Officencsc-nl · 2026-07-17
- unknownMultiple vulnerabilities in Microsoft products (July 15, 2026)cert-fr-avis · 2026-07-15
- unknownMultiple vulnerabilities in Microsoft Office (July 15, 2026)cert-fr-avis · 2026-07-15
- unknownexploitedNCSC-2026-0237 [1.00] [M/H] Vulnerabilities fixed in Microsoft Officencsc-nl · 2026-07-14
- mediumCVE-2026-55026: Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose…nvd · 2026-07-14
- mediumCVE-2026-55026: Microsoft Office Information Disclosure Vulnerabilitymsrc · 2026-07-14
External references
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