CVE-2022-26305: Execution of Untrusted Macros Due to Improper Certificate Validation

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-07-25 · updated 2026-06-17
Weakness: CWE-295

Description

An Improper Certificate Validation vulnerability in LibreOffice existed where determining if a macro was signed by a trusted author was done by only matching the serial number and issuer string of the used certificate with that of a trusted certificate. This is not sufficient to verify that the macro was actually signed with the certificate. An adversary could therefore create an arbitrary certificate with a serial number and an issuer string identical to a trusted certificate which LibreOffice would present as belonging to the trusted author, potentially leading to the user to execute arbitrary code contained in macros improperly trusted. This issue affects: The Document Foundation LibreOffice 7.2 versions prior to 7.2.7; 7.3 versions prior to 7.3.1.

Affected products

The Document Foundation LibreOffice: from 7.2.0 before 7.2.7; from 7.3.0 before 7.3.2 — fixed in 7.2.7, 7.3.2

How to fix

Upgrade to a fixed version: The Document Foundation LibreOffice 7.2.7, 7.3.2. Check the vendor advisory for mitigations.

References

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