CVE-2026-54588

Poweradmin has Host Header Injection in OIDC redirect_uri, SAML ACS/SLO URL, and Logout Redirect Construction.

State: Published
Severity: 9.6 Critical
Published: Jun 23, 2026
Updated: Jun 24, 2026
Reserved: Jun 15, 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.

Scores

CVSS	Score	Vector	Source
3.1	9.6 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L	GitHub_M

Weaknesses

CWE-20 Improper Input Validation
CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

Affected Products

Product	Versions
poweradminpoweradmin	< 4.2.4Affected >= 4.3.0, < 4.3.3Affected

References

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