TI-2025-19701 Aliases CVE-2025-26787 GHSA-93g4-gwqx-xffr

An error in the SignServer container startup logic was found in Keyfactor SignServer…

LOW 21CWE-642Published 2025-12-22 · Updated 2025-12-22

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · Low · Low
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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".

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00148 4th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:keyfactor:signserver::::::::	before 7.2	Vulnerable	Keyfactor

cpe:2.3:a:keyfactor:signserver:*:*:*:*:*:*:*:* Versions before 7.2 Vulnerable ·Keyfactor

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-26787
2026-10-03 Alias added: GHSA-93g4-gwqx-xffr

References

Advisory 1

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

Other 1

https://docs.keyfactor.com/signserver/latest/signserver-7-2-release-notes

TI-2025-29788 An arbitrary file write was found in Keyfactor SignServer versions prior to 7.3.2. CVSS 3.1MEDIUM 5.3
TI-2025-29787 A local file enumeration was found in Keyfactor SignServer versions prior to 7.3.2 .The… CVSS 3.1MEDIUM 5.3
TI-2025-29789 A class name enumeration was found in Keyfactor SignServer versions prior to 7.3.2. CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences