CVE-2026-25892
An attacker can POST version[] parameter which PHP converts to an array.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.59%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.59% probability · 74th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- adminer/adminer
- Source
- security-advisories@github.com
References
- https://github.com/vrana/adminer/commit/21d3a3150388677b18647d68aec93b7850e457d3Patch
- https://github.com/vrana/adminer/releases/tag/v5.4.2Product, Release Notes
- https://github.com/vrana/adminer/security/advisories/GHSA-q4f2-39gr-45jhExploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.