What is CVE-2025-26787?

CVE-2025-26787 is a medium-severity vulnerability in Keyfactor Signserver, classified under CWE-642. CVSS score: 4.7/10. Published 2025-12-22.

How severe is CVE-2025-26787?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Keyfactor Signserver

CVE-2025-26787

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".

EPSS: 0.001 (3.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.

Affected products

Keyfactor Signserver
N/a — versions n/a

Weakness classification (CWE)

CWE-642

References

cve@mitre.org (Vendor Advisory)
cve@mitre.org (Release Notes)

Frequently asked questions

What is CVE-2025-26787?: CVE-2025-26787 is a medium-severity vulnerability in Keyfactor Signserver, classified under CWE-642. CVSS score: 4.7/10. Published 2025-12-22.
How severe is CVE-2025-26787?: Medium severity. CVSS v3 base score is 4.7 out of 10.