CVE-2026-17543: PHP

Critical severity, CVSS 9.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Improper escaping of backslashes in attacker-provided parameters would allow for trivial SQL injection in PHP versions from 8.2.* before 8.2.33, from 8.3.* before 8.3.33, from 8.4.* before 8.4.24, and from 8.5.* before 8.5.9.

Affected products

• PHP PHP: from 8.2.0, before 8.2.33 (fixed in 8.2.33); from 8.3.0, before 8.3.33 (fixed in 8.3.33); from 8.4.0, before 8.4.24 (fixed in 8.4.24); from 8.5.0, before 8.5.9 (fixed in 8.5.9)

Published 2026-07-30. Last modified 2026-08-05.