PHP vulnerability advisories

Every CVE phpwarden knows about across the PHP engine, Composer packages and WordPress plugins, themes and core — ranked by real-world exploitation. Feed 2026.10.29.3, updated 2026-10-29. Browse by package.

19,303CVEs

8,638Composer advisories

12,328WordPress advisories

35Actively exploited (KEV) →

CVE	Package	Title	Severity	CVSS	EPSS
CVE-2021-21265	october/backend	October CMS vulnerable to Potential Host Header Poisoning on misconfigured servers	low	0.0	2%
CVE-2021-41114	typo3/cms, typo3/cms-core	HTTP Host Header Injection	medium	4.8	1%
CVE-2025-63828	backdrop/backdrop	Backdrop CMS Host Header Injection vulnerability	medium	0.0	0%

Severity and CVSS come from the upstream advisory (OSV.dev, NVD, FriendsOfPHP); KEV marks CVEs on CISA's Known Exploited Vulnerabilities list; EPSS is FIRST's 30-day exploitation probability. Rows sort exploitation-first: KEV, then EPSS, then CVSS.