Vulnerability in Libreoffice
CVE-2025-2866
Improper Verification of Cryptographic Signature vulnerability in LibreOffice allows PDF Signature Spoofing by Improper Validation. In the affected versions of LibreOffice a flaw in the verification code for adbe.pkcs7.sha1 signatures could cause invalid signatures to be accepted as valid This issue affects LibreOffice: from 24.8 before < 24.8.6, from 25.2 before < 25.2.2.
EPSS: 0.001 (1.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
Affected products
- Libreoffice — versions 24.8.0.0, 25.2.0.0
- The Document Foundation Libreoffice — versions 24.8, 25.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@documentfoundation.org (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-2866?
- CVE-2025-2866 is a medium-severity vulnerability in Libreoffice, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.5/10. Published 2025-04-27.
- How severe is CVE-2025-2866?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2025-2866 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.