CVE-2026-25734 — Rucio WebUI has Stored Cross-site Scripting (XSS) in RSE Metadata

Affected: rucio

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 RSE metadata 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.

GHSA-h9fp-p2p9-873q — Rucio WebUI has Stored Cross-site Scripting (XSS) in RSE Metadata

Affected: PyPI: rucio-webui

### Summary A stored Cross-site Scripting (XSS) vulnerability was identified in the RSE metadata 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.

--- ### Details Several metadata fields accept arbitrary input which is stored and later rendered unsafely in the WebUI when the RSEs are listed in the RSE Management dashboard.

**Create Path**: Admin > RSE Management

**Trigger Paths**: Admin > RSE Management Admin > RSE Management > _RSE NAME_

**Vulnerable Attributes**: City, Country_Name, ISP

**Request** ```http POST /proxy/rses/XSSTEST HTTP/1.1 ... {"city":"<script>alert('CITY XSS')</script>","country_name":"<script>alert('COUNTRY XSS')</script>","ISP":"<script>alert('ISP XSS')</script>","deterministic":false,"volatile":false,"staging_area":false} ```

**Response** ```http HTTP/1.1 201 CREATED ... Created ```

**Stored XSS payload triggering in RSE listing after adding XSS payload in metadata** <img width="1252" height="624" alt="Stored XSS payload triggering in RSE listing after adding XSS payload in metadata" src="https://github.com/user-attachments/assets/6546fc95-0c81-4db7-9271-37b5d4bc8f47" />

--- ### Impact Any authenticated user who views affected resources may execute attacker-controlled JavaScript in…

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CVE-2026-25734 — Rucio WebUI has Stored Cross-site Scripting (XSS) in RSE Metadata

GHSA-h9fp-p2p9-873q — Rucio WebUI has Stored Cross-site Scripting (XSS) in RSE Metadata