CVE-2026-54588

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 77% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.6Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.6
EG Score
9.6(medium)
EPSS
23.1%
KEV
Not listed

Published

June 23, 2026

Last Modified

June 25, 2026

Advisory Details (3)

Auto-updated Jun 24, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github.
github Patch Available🟡 PoC Available

Host Header Injection in OIDC redirect_uri, SAML ACS/SLO URL, and Logout Redirect Construction. · Advisory · poweradmin/poweradmin · GitHub

https://github.com/poweradmin/poweradmin/security/advisories/GHSA-3735-5339-xfwx
github_release Patch Available

v4.3.3

Patch available: poweradmin/poweradmin v4.3.3

https://github.com/poweradmin/poweradmin/releases/tag/v4.3.3
github_release Patch Available

v4.2.4

Patch available: poweradmin/poweradmin v4.2.4

https://github.com/poweradmin/poweradmin/releases/tag/v4.2.4

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 51× in last 7d / 137× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 137 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2026-54588?
CVE-2026-54588 is a critical vulnerability published on June 23, 2026. 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 HTTPHOST request header as the authoritative source for building callback URLs in its OIDC, SAML, and logout authentication flows without any validation. An…
When was CVE-2026-54588 disclosed?
CVE-2026-54588 was first published in the National Vulnerability Database on June 23, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54588 actively exploited?
CVE-2026-54588 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 23.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54588?
CVE-2026-54588 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-54588?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54588, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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