Takahe through 0.11.0 Cross-Site Scripting via javascript: URL Scheme

Advisories

Takahe through 0.11.0 Cross-Site Scripting via javascript: URL Scheme

severity: medium
date: 9/14/2026
Affecting: takahe <= 0.11.0
CVE: CVE-2026-91146
CWE: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS: 5.3
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
References: GitHub Issue #728
https://github.com/jointakahe/takahe
core/html.py at 0.11.0
Credit: George Chen
Description: Takahe through 0.11.0 fails to restrict URL schemes in link hrefs within federated post content and profile summaries, allowing remote actors to inject javascript: links. Attackers can deliver federated content with malicious javascript: hrefs that execute in the instance origin when clicked, enabling session hijacking or impersonation of viewers.

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