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CVE-2026-25136

Cern Rucio cross-site scripting (XSS)

8.1 HIGHPublic exploitEPSS 0.27%
  1. Published25 Feb 2026

Description

Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. A reflected Cross-site Scripting vulnerability was located in versions prior to 35.8.3, 38.5.4, and 39.3.1 in the rendering of the ExceptionMessage of the WebUI 500 error which could allow attackers to steal login session tokens of users who navigate to a specially crafted URL. Versions 35.8.3, 38.5.4, and 39.3.1 fix the issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected products

Cern Rucio≥ 36.0.0 < 38.5.4 · ≥ 39.0.0 < 39.3.1 · < 35.8.3

Remediation

Fixed in
Cern Rucio≥ 38.5.4

References

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Frequently asked

Is CVE-2026-25136 being actively exploited?

CVE-2026-25136 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.27%.

How severe is CVE-2026-25136?

CVE-2026-25136 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.27% probability of exploitation.

Which products are affected by CVE-2026-25136?

Affected products include Cern Rucio.

How do I fix CVE-2026-25136?

Upgrade affected software to a fixed version, for example Cern Rucio 38.5.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-25136 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.