CVE-2026-25136 Rucio WebUI has a Reflected Cross-site Scripting Vulnerability
Attackers can steal user session tokens via reflected XSS in the WebUI error page, requiring an upgrade to secure the application.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-25136?
CVE-2026-25136 is a high-severity cross-site scripting vulnerability in rucio, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-25136?
7 open source packages ship an affected version, including rucio-webui. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
rucio-webui PyPI | All versions | 35.8.3, 38.5.4, 39.3.1 |
rucio-webui PyPI | All versions | 35.8.3 |
rucio-webui PyPI | All versions | 35.8.3 |
rucio-webui PyPI | From 36.0.0rc1 | 38.5.4 |
rucio-webui PyPI | From 36.0.0rc1 | 38.5.4 |
rucio-webui PyPI | From 39.0.0rc1 | 39.3.1 |
1 more packages
rucio-webui PyPI | From 39.0.0rc1 | 39.3.1 |
Products include Cern Rucio.
How do I fix CVE-2026-25136?
Upgrade rucio-webui to a fixed version for your release line: 35.8.3, 38.5.4 or 39.3.1.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-25136 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25136 exists.
Other vulnerabilities in rucio
- CVE-2026-29080 Rucio SQL Injection in FilterEngine Oracle JSON Path via DID Search API
- CVE-2026-29090 Rucio SQL injection in postgres_meta DID search path compromises PostgreSQL metadata database
- CVE-2026-25733 Rucio WebUI Vulnerable to Stored Cross-site Scripting (XSS) through Custom Rule Function
- CVE-2026-25734 Rucio WebUI has Stored Cross-site Scripting (XSS) in RSE Metadata
- CVE-2026-25735 Rucio WebUI has a Stored Cross-site Scripting (XSS) vulnerability its Identity Name
Sources
Also known as GHSA-h79m-5jjm-jm4q, PYSEC-2026-3056.