Vulnerability · Published Feb 25, 2026 · Assigned by GitHub_M
CVE-2026-25733Rucio WebUI Vulnerable to Stored Cross-site Scripting (XSS) through Custom Rule Function
High 7.3
In plain English
A high-severity cross-site scripting in rucio from rucio. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 Rules function 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | rucio-webui | 35.8.3 | GHSA-rwj9-7j48-9f7q |
| PyPI | rucio-webui | 38.5.4 | GHSA-rwj9-7j48-9f7q |
| PyPI | rucio-webui | 39.3.1 | GHSA-rwj9-7j48-9f7q |
| PyPI | rucio-webui | 35.8.3, 38.5.4, 39.3.1 | PYSEC-2026-3058 |
Affected products (as reported)
Weakness: CWE-79, CWE-1004 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
References
- https://github.com/rucio/rucio/security/advisories/GHSA-rwj9-7j48-9f7q x_refsource_CONFIRM
- https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html x_refsource_MISC
- https://github.com/rucio/rucio/releases/tag/35.8.3 x_refsource_MISC
- https://github.com/rucio/rucio/releases/tag/38.5.4 x_refsource_MISC
- https://github.com/rucio/rucio/releases/tag/39.3.1 x_refsource_MISC