CVE-2025-2866

PDF signature forgery with adbe.pkcs7.sha1 SubFilter

Severity Score

2.4

*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

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.

Juraj Šarinay discovered that LibreOffice incorrectly handled verifying PDF signatures. A remote attacker could possibly use this issue to generate PDF files that appear to have a valid signature.

*Credits: Thanks to Juraj Šarinay for discovering this issue and for providing a fix

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

Passive

System

Vulnerable | Subsequent

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2025-03-27 CVE Reserved
2025-04-27 CVE Published
2025-04-28 CVE Updated
2025-05-29 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-347: Improper Verification of Cryptographic Signature

CAPEC

CAPEC-475: Signature Spoofing by Improper Validation

References (1)

URL	Tag	Source
https://www.libreoffice.org/about-us/security/advisories/cve-2025-2866

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
The Document Foundation Search vendor "The Document Foundation"		Libreoffice Search vendor "The Document Foundation" for product "Libreoffice"				*		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				*		-		Affected