What’s Vulnerable › Vulnerabilities

CVE-2025-26787

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-22 · updated 2026-06-17
• Weakness: CWE-642

Description

An error in the SignServer container startup logic was found in Keyfactor SignServer versions prior to 7.2. The Admin CLI command used to configure Certificate access to the initial startup of the container sets a property of "allowany" to allow any user with a valid and trusted client auth certificate to connect. Admins can then set more restricted access to specific certificates. A logic error caused this admin CLI command to be run on each restart of the container instead of only the first startup as intended resetting the configuration to "allowany".

Affected products

• Keyfactor Signserver: before 7.2 — fixed in 7.2

How to fix

Upgrade to a fixed version: Keyfactor Signserver 7.2. Check the vendor advisory for mitigations.

References

• https://docs.keyfactor.com/signserver/latest/signserver-7-2-release-notes
• https://support.keyfactor.com/hc/en-us/articles/33997706776987-SignServer-security-advisory-Container-vulnerability-CVE-2025-26787-fixed-in-version-7-2

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