[CRITICAL] Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs

PKSA-5xds-5mf3-ckxn CVE-2026-55791 GHSA-c55v-343g-5xff

Affected version: >=4.0.0-RC1,<4.18|>=5.0.0-RC1,<5.10

Reported by:
GitHub

[HIGH] Craft CMS's Missing Volume Permission Check in AssetsController::actionShowInFolder Allows Information Disclosure

PKSA-tj2m-c963-6jtt CVE-2026-44012 GHSA-33m5-hqp9-97pw

Affected version: >=5.0.0-RC1,<5.9.18

Reported by:
GitHub

[HIGH] Craft CMS has Potential Authenticated Remote Code Execution via Malicious Attached Behavior

PKSA-7b21-z11x-97gc CVE-2026-44011 GHSA-qrgm-p9w5-rrfw

Affected version: >=5.0.0,<5.9.18|>=4.0.0,<4.17.12

Reported by:
GitHub

[HIGH] Craft CMS's Missing Authorization in GraphQL Address Resolver Allows Cross-Scope PII Disclosure

PKSA-sxz1-z4jg-2vhh CVE-2026-44010 GHSA-gj2p-p9m4-c8gw

Affected version: >=4.0.0,<4.17.12|>=5.0.0,<5.9.18

Reported by:
GitHub