CVE-2026-25736
What it is
Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. Versions prior to 35.8.3, 38.5.4, and 39.3.1 have a stored Cross-Site Scripting (XSS) vulnerability in the Custom RSE Attribute of the WebUI where attacker-controlled input is persisted by the backend and later rendered in the WebUI without proper output encoding. This allows arbitrary JavaScript execution in the context of the WebUI for users who view affected pages, potentially enabling session token theft or unauthorized actions. Versions 35.8.3, 38.5.4, and 39.3.1 fix the issue.
At a glance
- Exploitability
- Can be exploited over the network with an admin-level account, but needs a user to act. High risk of data exposure, data tampering.
- Exploit odds
- 0.3% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.3% in the next 30 days (EPSS).
- Severity: 6.1 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.3% · EPSS, next 30 days
- Weakness
- CWE-79 · Cross-site scripting
- Record status
- Analyzed
Affected
- Cern Rucio < 35.8.3
- Cern Rucio < 38.5.4
- Cern Rucio < 39.3.1
Attack profile CVSS 3.1 · 6.1
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Raw vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-25736.md and follow it. Check whether this project is affected by CVE-2026-25736. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/rucio/rucio/releases/tag/35.8.3
- https://github.com/rucio/rucio/releases/tag/38.5.4
- https://github.com/rucio/rucio/releases/tag/39.3.1
- https://github.com/rucio/rucio/security/advisories/GHSA-fq4f-4738-rqxm
- https://github.com/rucio/rucio/security/advisories/GHSA-fq4f-4738-rqxm
References
- https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html
- https://github.com/rucio/rucio/releases/tag/35.8.3
- https://github.com/rucio/rucio/releases/tag/38.5.4
- https://github.com/rucio/rucio/releases/tag/39.3.1
- https://github.com/rucio/rucio/security/advisories/GHSA-fq4f-4738-rqxm
- https://github.com/rucio/rucio/security/advisories/GHSA-fq4f-4738-rqxm