# 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.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L`)
- **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:** Yes
- **Published:** 23 Jun 2026
- **Updated:** 24 Jun 2026
- **Also known as:** GHSA-3735-5339-xfwx

## 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.

Weakness: CWE-601 (URL Redirection to Untrusted Site), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-54588?

4 open source packages ship an affected version, including poweradmin/poweradmin.


| Package | Ecosystem | 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54588 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-54588 in the wild and no public exploit code.

Affected packages and fixed versions:
- poweradmin/poweradmin (Packagist): affected all versions; fixed in 4.2.4
- poweradmin/poweradmin (Packagist): affected all versions; fixed in 4.2.4
- poweradmin/poweradmin (Packagist): affected from 4.3.0; fixed in 4.3.3
- poweradmin/poweradmin (Packagist): affected from 4.3.0; fixed in 4.3.3

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-54588/ (Markdown: https://insights.sbomify.com/CVE-2026-54588/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54588
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54588
- OSV: https://osv.dev/vulnerability/CVE-2026-54588

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54588/
Summaries are generated and may contain mistakes; the official description above is the record.