What is the CVSS score of CVE-2026-25136?

CVE-2026-25136 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of Rucio are affected by CVE-2026-25136?

A high-severity vulnerability (CVE-2026-25136) affecting Rucio data management software has been publicly disclosed with working exploits available, but no patch is currently available from the…. A patch is available.

Is there a public PoC exploit available for CVE-2026-25136?

Yes, a public proof-of-concept exploit is available for CVE-2026-25136. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-25136?

Within 24 hours: Identify all Rucio instances in your environment and isolate them from untrusted networks; notify the Rucio security team for patch timeline. Within 7 days: Implement network segmentation to restrict access to Rucio services, enforce multi-factor authentication, and review access logs for suspicious activity. Within 30 days: Monitor vendor communications for patch availability; evaluate alternative data management solutions if patch timeline is unacceptable; conduct security assessment of exposed data.

Rucio CVE-2026-25136

HIGH

Cross-site Scripting (XSS) (CWE-79)

2026-02-25 security-advisories@github.com

GHSA-h79m-5jjm-jm4q

XSS Rucio Cern

8.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

8.1 HIGH

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 27, 2026 - 15:43 vuln.today

Public exploit code

CVE Published

Feb 25, 2026 - 20:23 nvd

HIGH 8.1

DescriptionGitHub Advisory

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.

AnalysisAI

Session hijacking in Rucio's WebUI error page allows unauthenticated attackers to steal user login tokens via reflected cross-site scripting in specially crafted URLs, affecting versions prior to 35.8.3, 38.5.4, and 39.3.1. Public exploit code exists for this vulnerability. Users should upgrade to patched versions immediately as no workarounds are available.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Rucio. 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.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.