How severe is CVE-2026-25138?

CVE-2026-25138 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-25138 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25138?

CVE-2026-25138 affects Cern Rucio. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25138?

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

Does CVE-2026-25138 have an EU (EUVD) identifier?

Yes. CVE-2026-25138 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8712.

When was CVE-2026-25138 published?

CVE-2026-25138 was published on 2026-02-25 and last updated on 2026-06-17.

CVE-2026-25138

CVE-2026-25138 is a medium-severity vulnerability in Cern Rucio with a CVSS 3.x base score of 5.3. 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-204.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8712
Weakness: CWE-204
Affected product: Cern Rucio
Published: 2026-02-25
Last modified: 2026-06-17

Description

Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. Prior to versions 35.8.3, 38.5.4, and 39.3.1, the WebUI login endpoint returns distinct error messages depending on whether a supplied username exists, allowing unauthenticated attackers to enumerate valid usernames. Versions 35.8.3, 38.5.4, and 39.3.1 fix the issue.

Frequently asked questions

What is CVE-2026-25138?: Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. Prior to versions 35.8.3, 38.5.4, and 39.3.1, the WebUI login endpoint returns distinct error messages depending on whether a supplied username exists, allowing unauthenticated attackers to enumerate valid usernames. Versions 35.8.3, 38.5.4, and 39.3.1 fix the issue.
How severe is CVE-2026-25138?: CVE-2026-25138 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-25138 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25138?: CVE-2026-25138 affects Cern Rucio. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25138?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25138 have an EU (EUVD) identifier?: Yes. CVE-2026-25138 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8712.
When was CVE-2026-25138 published?: CVE-2026-25138 was published on 2026-02-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cern:rucio:*:*:*:*:*:*:*:*

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