CVE-2026-55121
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
- Low exploitation risk0.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all EPSS-scored CVEs.
Advisory coverage (3)
- critical[NEW] [critical] Microsoft Office products: Multiple vulnerabilitiescert-bund · 2026-08-13
- mediumCVE-2026-55121: Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information…nvd · 2026-07-14
- mediumCVE-2026-55121: Microsoft Office Information Disclosure Vulnerabilitymsrc · 2026-07-14
External references
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[](https://www.csirts.com/cve/CVE-2026-55121)