{"id":"CVE-2026-54588","aliases":["GHSA-3735-5339-xfwx"],"url":"https://o3.security/vulnerability/CVE-2026-54588","summary":"Poweradmin has Host Header Injection in OIDC redirect_uri, SAML ACS/SLO URL, and Logout Redirect Construction.","details":"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.","published":"2026-06-23T22:09:27.268Z","modified":"2026-08-12T03:51:22.967233492Z","cvss":{"score":9.6,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"poweradmin/poweradmin","fixedVersion":"4.2.4"},{"ecosystem":"Packagist","name":"poweradmin/poweradmin","fixedVersion":"4.3.3"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/poweradmin/poweradmin/releases/tag/v4.2.4"},{"type":"WEB","url":"https://github.com/poweradmin/poweradmin/releases/tag/v4.3.3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54588.json"},{"type":"ADVISORY","url":"https://github.com/poweradmin/poweradmin/security/advisories/GHSA-3735-5339-xfwx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54588"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:22.967233492Z"}}