CVE-2026-55792

The record

Craft CMS is a content management system (CMS). In versions starting from 4.0.0-RC1 and prior to 4.18.0, and 5.0.0-RC1 and above, prior to 5.10.0, the dataUrl() Twig function is included in Craft’s Twig sandbox allowlist, allowing any control panel user granted the utility:system-messages permission to embed a file-reading payload into system email templates. When those emails are sent, the server reads the target file and returns its contents as a base64-encoded data URL embedded in the email body. The .env file, which typically contains the database password, CRAFT_SECURITY_KEY, and third-party API keys, passes all of Craft’s existing dataUrl() protection checks and is fully exfiltrated. Obtaining CRAFT_SECURITY_KEY enables an attacker to forge session tokens and escalate to full admin account takeover. This issue has been fixed in versions 4.18.0 and 5.10.0.

Affected packages

Related vulnerabilities

• CVE-2026-62979 jack lets users share media libraries through their Radarr/Sonarr stack, peer-to-peer. CWE-200
• CVE-2026-55098 Arc is an open, SQL-native time-series database for telemetry. CWE-200
• CVE-2026-119331 Ladybird is a truly independent web browser. CWE-200
• CVE-2026-62264 PDF Reader MCP is a Model Context Protocol server for reading PDF documents. CWE-200
• CVE-2026-110305 The Advanced Custom Fields: Extended plugin for WordPress is vulnerable to Sensitive… CWE-200
• CVE-2026-61730 SOCFortress CoPilot focuses on providing a single pane of glass for all your security… CWE-200
• CVE-2026-119570 Parse Server from 9.7.0 before 9.10.5-alpha.7 contains an information disclosure… CWE-200
• CVE-2026-14467 An information disclosure vulnerability in the Forocoches comments editor that allows an… CWE-200