Anubis vulnerable to possible XSS via redir parameter when using subrequest auth mode

CVE-2025-64716 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Summary

When using subrequest authentication, Anubis did not perform validation of the redirect URL and redirects user to any URL scheme. While most modern browsers do not allow a redirect to javascript: URLs, it could still trigger dangerous behavior in some cases.

GET https://example.com/.within.website/?redir=javascript:alert() responds with Location: javascript:alert().

Impact

Anybody with a subrequest authentication seems affected. Using javascript: URLs will probably be blocked by most modern browsers, but using custom protocols for third-party applications might still trigger dangerous operations.

Note

This was originally reported by @mbiesiad against Weblate.

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2025-10-30 17:08:12 UTC
Updated
2025-11-15 03:11:18 UTC
GitHub reviewed
2025-10-30 17:08:12 UTC
NVD published
2025-11-12

EPSS Score

Score Percentile
0.06% 20.09%

CVSS Scores

Base score Version Severity Vector
5.1 4.0 —
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:L)
Exploitation conditions are straightforward and stable.
Attack requirements (AT:P)
Additional preconditions must be present for exploitation.
Privileges required (PR:N)
No privileges are required.
User interaction (UI:P)
A user has to participate (for example click/open/approve).
Vulnerable system confidentiality impact (VC:N)
No confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:N)
No integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:N)
No availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:L)
Limited confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:H)
High integrity impact on subsequent systems.
Subsequent system availability impact (SA:N)
No availability impact on subsequent systems.

Identifiers

Type Value
GHSA GHSA-cf57-c578-7jvv ↗
CVE CVE-2025-64716 ↗

CWEs

CWE id Name
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

Credits

  • nijel (reporter)
  • mbiesiad (reporter)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
go github.com/TecharoHQ/anubis < 1.23.0 1.23.0 —

References

cvelogic Threat Intelligence