What’s Vulnerable › Vulnerabilities

CVE-2026-91146: Takahe through 0.11.0 Cross-Site Scripting via javascript: URL Scheme

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-23
• Weakness: CWE-79

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.

Affected products

• jointakahe takahe: through 0.11.0

References

• https://github.com/jointakahe/takahe
• https://github.com/jointakahe/takahe/blob/0.11.0/core/html.py
• https://github.com/jointakahe/takahe/issues/728
• https://www.vulncheck.com/advisories/takahe-through-0.11.0-cross-site-scripting-via-javascript-url-scheme

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