# CVE-2026-54588

## Summary

- **CVE ID:** CVE-2026-54588
- **Severity:** CRITICAL
- **CVSS Score:** 9.6 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L)
- **CWE:** CWE-20, CWE-601
- **Published:** Jun 23, 2026
- **Last Modified:** Jun 24, 2026

## 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.

## Affected Products

- poweradmin — poweradmin (< 4.2.4)
- poweradmin — poweradmin (>= 4.3.0, < 4.3.3)

## References

- [CNA](https://github.com/poweradmin/poweradmin/security/advisories/GHSA-3735-5339-xfwx)
- [CNA](https://github.com/poweradmin/poweradmin/releases/tag/v4.2.4)
- [CNA](https://github.com/poweradmin/poweradmin/releases/tag/v4.3.3)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.54%
- **EPSS Percentile:** 43.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._