How severe is CVE-2025-26787?

CVE-2025-26787 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-26787 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-26787?

CVE-2025-26787 affects Keyfactor Signserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-26787?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-26787 have an EU (EUVD) identifier?

Yes. CVE-2025-26787 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204738.

When was CVE-2025-26787 published?

CVE-2025-26787 was published on 2025-12-22 and last updated on 2026-06-17.

CVE-2025-26787

CVE-2025-26787 is a medium-severity vulnerability in Keyfactor Signserver with a CVSS 3.x base score of 4.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-642.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-204738
Weakness: CWE-642
Affected product: Keyfactor Signserver
Published: 2025-12-22
Last modified: 2026-06-17

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".

Frequently asked questions

What is 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".
How severe is CVE-2025-26787?: CVE-2025-26787 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-26787 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-26787?: CVE-2025-26787 affects Keyfactor Signserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-26787?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-26787 have an EU (EUVD) identifier?: Yes. CVE-2025-26787 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204738.
When was CVE-2025-26787 published?: CVE-2025-26787 was published on 2025-12-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:keyfactor:signserver:*:*:*:*:*:*:*:*

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