Quick answers
- Is CVE-2026-56703 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-56703 being exploited in the wild.
- How severe is CVE-2026-56703?
- High severity, with a CVSS score of 7.2, published 25 August 2026.
- Which products and versions are affected?
- Adminer before 5.4.3.
- Is there a fix for CVE-2026-56703?
- A patch was published on 2026-08-25: Version 5.4.3 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-56703 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-56703?
- Check whether you run Adminer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a code injection flaw (CWE-94) caused by an incomplete blocklist (CWE-184) in SQLite query restrictions. Adminer blocks the ATTACH command to prevent arbitrary file creation, but fails to restrict the VACUUM INTO command, which can write a database file containing attacker-controlled PHP code to any path with any extension. An authenticated SQLite user can craft a CREATE TABLE statement with embedded PHP code, then use VACUUM INTO to write the database to the web root as a .php file, which is then executed by the PHP interpreter. The attack requires network access to Adminer and valid SQLite authentication credentials, but no user interaction. The vulnerability was patched in version 5.4.3.
Affected products
- Adminer Adminer before 5.4.3
Timeline
- 2026-07-09: disclosed
- 2026-08-25: advisory
- 2026-08-25: patched: Version 5.4.3 released