CVE-2025-26787
4.7 · MEDIUMOverview
CVE-2025-26787 is a medium-severity vulnerability affecting keyfactor signserver. It was published on December 22, 2025 and has a CVSS 3.1 base score of 4.7 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical 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".
Remediation
Check the references section for vendor advisories and patches from keyfactor. Update signserver to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| keyfactor | signserver | >= 0, < 7.2 | Affected |
Frequently Asked Questions
What is CVE-2025-26787?
CVE-2025-26787 is a medium-severity vulnerability affecting keyfactor signserver. It was published on December 22, 2025 and has a CVSS 3.1 base score of 4.7 (MEDIUM).
How severe is CVE-2025-26787?
This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2025-26787?
Check the references section for vendor advisories and patches from keyfactor. Update signserver to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-26787?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-26787 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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