What is CVE-2026-17543?

CVE-2026-17543 is a critical-severity vulnerability in PHP, classified under SQL Injection. CVSS score: 9.8/10. Published 2026-07-30.

How severe is CVE-2026-17543?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-17543 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SQL Injection in PHP

CVE-2026-17543

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.

Vulnerability class: SQL Injection

EPSS: 0.003 (25.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Php
Php Group — versions 8.2.*, 8.3.*, 8.4.*

Weakness classification (CWE)

CWE-89 — SQL Injection

Public proof-of-concept exploits

References

security@php.net (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-17543?: CVE-2026-17543 is a critical-severity vulnerability in PHP, classified under SQL Injection. CVSS score: 9.8/10. Published 2026-07-30.
How severe is CVE-2026-17543?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-17543 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.