What is CVE-2026-91146?

CVE-2026-91146 is a medium-severity vulnerability in Jointakahe Takahe, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-09-14.

How severe is CVE-2026-91146?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Jointakahe Takahe

CVE-2026-91146

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-09-14 · last modified 2026-09-23.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (27.2th percentile), scored 2026-10-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Jointakahe Takahe

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/jointakahe/takahe/issues/728 (issue-tracking)
github.com/jointakahe/takahe (product)
github.com/jointakahe/takahe/blob/0.11.0/core/html.py (technical-description)
www.vulncheck.com/advisories/takahe-through-0.11.0-cross-site-scripting-via-jav… (third-party-advisory)

Frequently asked questions

What is CVE-2026-91146?: CVE-2026-91146 is a medium-severity vulnerability in Jointakahe Takahe, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-09-14.
How severe is CVE-2026-91146?: Medium severity. CVSS v3 base score is 6.1 out of 10.