{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-54588: Poweradmin has Host Header Injection in OIDC redirect_uri, SAML ACS/SLO URL, and Logout Redirect Construction.","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-54588","status":"final","version":"1","initial_release_date":"2026-06-23T22:09:27.268Z","current_release_date":"2026-06-23T22:09:27.268Z","revision_history":[{"date":"2026-06-23T22:09:27.268Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-54588 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-54588"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-54588"},{"category":"external","summary":"https://github.com/poweradmin/poweradmin/security/advisories/GHSA-3735-5339-xfwx","url":"https://github.com/poweradmin/poweradmin/security/advisories/GHSA-3735-5339-xfwx"},{"category":"external","summary":"https://github.com/poweradmin/poweradmin/releases/tag/v4.2.4","url":"https://github.com/poweradmin/poweradmin/releases/tag/v4.2.4"},{"category":"external","summary":"https://github.com/poweradmin/poweradmin/releases/tag/v4.3.3","url":"https://github.com/poweradmin/poweradmin/releases/tag/v4.3.3"}]},"product_tree":{"branches":[{"category":"vendor","name":"poweradmin","branches":[{"category":"product_name","name":"poweradmin","branches":[{"category":"product_version","name":"< 4.2.4","product":{"name":"poweradmin poweradmin < 4.2.4","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:poweradmin:poweradmin:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 4.3.0, < 4.3.3","product":{"name":"poweradmin poweradmin >= 4.3.0, < 4.3.3","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:poweradmin:poweradmin:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-54588","title":"Poweradmin has Host Header Injection in OIDC redirect_uri, SAML ACS/SLO URL, and Logout Redirect Construction.","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L","baseScore":9.6,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1","CSAFPID-2"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1","CSAFPID-2"]}]}]}