CVE-2026-54588 Poweradmin has Host Header Injection in OIDC redirect_uri, SAML ACS/SLO URL, and Logout Redirect Construction.
An attacker can manipulate HTTP Host headers to redirect authentication flows, leading to full account takeover without credentials.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-54588?
CVE-2026-54588 is a critical vulnerability in poweradmin, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-54588?
4 open source packages ship an affected version, including poweradmin/poweradmin.
| Package | Affected | Fixed in |
|---|---|---|
poweradmin/poweradmin Packagist | All versions | 4.2.4 |
poweradmin/poweradmin Packagist | All versions | 4.2.4 |
poweradmin/poweradmin Packagist | From 4.3.0 | 4.3.3 |
poweradmin/poweradmin Packagist | From 4.3.0 | 4.3.3 |
How do I fix CVE-2026-54588?
Upgrade poweradmin/poweradmin to a fixed version for your release line: 4.2.4 or 4.3.3.
Is CVE-2026-54588 being exploited?
There is no known exploitation of CVE-2026-54588 in the wild and no public exploit code.
Sources
Also known as GHSA-3735-5339-xfwx.