CVE-2025-26787: An error in the SignServer container startup logic was found in Keyfactor SignServer versions prior to 7.2

Q: How do I fix CVE-2025-26787?

signserver: upgrade to 7.2. Exact commands for each OS are on this page.

Q: Is CVE-2025-26787 being exploited?

CVE-2025-26787 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-26787 affect?

CVE-2025-26787 affects signserver. Severity is medium (CVSS 4.7). 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

Q: How urgent is CVE-2025-26787?

Priority 17/100. No elevated risk signals yet.

Routine

MEDIUM 4.7UPGRADE

CVE-2025-26787 is a medium-severity flaw (CVSS 4.7) affecting signserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 res

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-642
Published	2025-12-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: keyfactor

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-22 19:15 UTCPublished CVE record published
2026-06-17 09:02 UTCUpdated Record last modified

keyfactor signserver UPGRADE

Affected: < 7.2

Fixed in: 7.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy signserver || rpm -q signserver || signserver --version

2. UPGRADE to 7.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade signserver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade signserver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-26787?

signserver: upgrade to 7.2. Exact commands for each OS are on this page.

Is CVE-2025-26787 being exploited?

CVE-2025-26787 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-26787 affect?

CVE-2025-26787 affects signserver. Severity is medium (CVSS 4.7). 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

How urgent is CVE-2025-26787?

Priority 17/100. No elevated risk signals yet.

Related CVEs

CVE-2025-47222 MEDIUM 6.5 UPGRADE A class name enumeration was found in Keyfactor SignServer versions prior to 7.3.2
CVE-2025-47221 MEDIUM 5.3 UPGRADE An arbitrary file write was found in Keyfactor SignServer versions prior to 7.3.2
CVE-2025-47220 MEDIUM 5.3 UPGRADE A local file enumeration was found in Keyfactor SignServer versions prior to 7.3.2 .The property VISIBLE_SIGNA

References

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