CVE-2025-2866 PDF signature forgery with adbe.pkcs7.sha1 SubFilter
Attackers can forge PDF signatures in LibreOffice by exploiting improper validation of adbe.pkcs7.sha1 signatures, bypassing integrity checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-2866?
CVE-2025-2866 is a low-severity vulnerability in Libreoffice Libreoffice, published on 27 Apr 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-347
Which versions are affected by CVE-2025-2866?
It affects 1 product.
Products include Libreoffice Libreoffice.
How do I fix CVE-2025-2866?
Upgrade to a fixed version.
Is CVE-2025-2866 being exploited?
There is no known exploitation of CVE-2025-2866 in the wild and no public exploit code.
Other vulnerabilities in Libreoffice Libreoffice
Sources
Also known as BELL-CVE-2025-2866, DEBIAN-CVE-2025-2866, DSA-5908-1, GHSA-22mj-r7hq-f9h2, MGASA-2025-0154, UBUNTU-CVE-2025-2866 and 1 more.