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CVE-2026-25736

Vulnerability in rucio-webui (CVE-2026-25736)

Summary

Vulnerability in rucio-webui (CVE-2026-25736). Confidential information can be exposed externally. Exploitable via POST /proxy/rses/WEB1/attr/XSS. Mitigation: upgrade to 39.3.1 or later.

Original description

The description as published by the source.

Summary

A stored Cross-site Scripting (XSS) vulnerability was identified 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.

Details

A stored XSS payload can be introduced via a custom RSE attribute value and is later rendered when the RSE is viewed.

Create Path:
Admin > RSE Management > RSE NAME > Add Attribute

Trigger Path:
Admin > RSE Management > RSE NAME

Request

POST /proxy/rses/WEB1/attr/XSS HTTP/1.1
...
{"value":"alert('XSS')"}

Response

HTTP/1.1 201 CREATED
...
Created

Storing XSS Payload in RSE Attribute

XSS Payload triggering when viewing RSE

Impact

Any authenticated user who views affected resources may execute attacker-controlled JavaScript in the WebUI origin. Depending on the affected feature, this may impact all users or administrative users only.

The impact is amplified by:

  • Session cookies that are accessible to JavaScript (missing HttpOnly flag).
  • API tokens exposed to the WebUI via JavaScript variables.

An attacker would likely attempt to exfiltrate the session token to an external site by setting an encoded version of the cookie as the path of a GET request to an attacker controlled site (i.…

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-25736 has been found in rucio-webui.
Attackers can target a specific entry point like POST /proxy/rses/WEB1/attr/XSS over the network to misuse the product.
Confidential information can be exposed externally.
What to do: upgrade rucio-webui to 39.3.1 or later.
If unsure, ask your IT team or search "rucio-webui CVE-2026-25736" on the vendor's site.

CVE-2026-25736 (rucio-webui) — CWE-1004
Attack vector: remote (network-reachable)
Attack surface: POST /proxy/rses/WEB1/attr/XSS / token
Patched: 39.3.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-1004) exists in rucio-webui. Attackers reach the vulnerable code path via POST /proxy/rses/WEB1/attr/XSS.

📍 Affected scope

Check the vendor advisory for the affected versions of rucio-webui. Attack surface: POST /proxy/rses/WEB1/attr/XSS / token.

🔥 Severity

Severity: ?. Confidential information can be exposed externally.

🔧 How to fix

Update to 39.3.1.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual POST /proxy/rses/WEB1/attr/XSS requests with malformed payloads or SQL meta-characters. Run grep -r 'rucio-webui' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'rucio-webui' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で rucio-webui を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Hunt for indicators of compromise detect 
    grep 'POST /proxy/rses/WEB1/attr/XSS' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'

    アクセスログで POST /proxy/rses/WEB1/attr/XSS への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。

  3. 3
    Apply patch patch 
    Upgrade rucio-webui to 39.3.1

    ステージング環境で 39.3.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 2 で見つけた異常検知の続報チェックを含めること。

  4. 4
    Post-deployment verification verify 
    Replay attack against POST /proxy/rses/WEB1/attr/XSS on staging to confirm patch closes the vector

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 2 と同じログクエリでアラート再発が無いか継続監視。

Affected packages

PyPI rucio-webui
[{"type":"ECOSYSTEM","events":[{"introduced":"39.0.0rc1"},{"fixed":"39.3.1"}]}]

References

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