Description

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.

Classification

CVE ID: CVE-2025-2866

CVSS Base Severity: LOW

CVSS Base Score: 2.4

CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

Affected Products

Vendor: The Document Foundation

Product: LibreOffice

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 4.09% (scored less or equal to compared to others)

EPSS Date: 2025-05-26 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-2866
https://www.libreoffice.org/about-us/security/advisories/cve-2025-2866

Timeline