{"id":"CVE-2026-55792","aliases":["GHSA-287w-mxq6-x2cp"],"url":"https://o3.security/vulnerability/CVE-2026-55792","summary":"Craft CMS: Sensitive File Disclosure / Server-Side File Read","details":"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.","published":"2026-07-01T23:20:28.993Z","modified":"2026-08-12T03:51:40.146346522Z","cvss":null,"epss":{"score":0.00397,"percentile":0.32987,"asOf":"2026-09-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"craftcms/cms","fixedVersion":"4.18.0"},{"ecosystem":"Packagist","name":"craftcms/cms","fixedVersion":"5.10.0"}],"fix":{"url":"https://github.com/craftcms/cms/pull/18559","label":"craftcms/cms#18559"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55792.json"},{"type":"ADVISORY","url":"https://github.com/craftcms/cms/security/advisories/GHSA-287w-mxq6-x2cp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55792"},{"type":"FIX","url":"https://github.com/craftcms/cms/pull/18559"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:40.146346522Z"}}