{"id":"CVE-2026-74997","title":"In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values","summary":"In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values. This issue only affects Roundcube instances using th…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-78"],"vendor":"roundcube","product":"webmail","affected":["webmail >= 1.6.0, < 1.6.18","webmail >= 1.7.0, < 1.7.3"],"patched":["webmail 1.7.3"],"published":"2026-08-17","updated":"2026-09-08","sourceUpdated":"2026-09-08T19:09:05.140","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74997","references":[{"url":"https://github.com/roundcube/roundcubemail/commit/14044f843cfacbe78b042f659e379d6b4497aa7c","label":"cve@mitre.org"},{"url":"https://github.com/roundcube/roundcubemail/commit/495d211638f222336b20f4744545c53712426c2a","label":"cve@mitre.org"},{"url":"https://github.com/roundcube/roundcubemail/commit/b8f90e28a46d42e79a69568cba897f8f4223d9cd","label":"cve@mitre.org"},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.6.18","label":"cve@mitre.org"},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.7.3","label":"cve@mitre.org"},{"url":"https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3","label":"cve@mitre.org"}],"tags":["nvd"],"epss":0.00784,"epssPercentile":0.54095,"ingestedAt":"2026-09-08T20:10:03.157Z","slug":"CVE-2026-74997","body":"## Overview\n\nIn Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values. This issue only affects Roundcube instances using the markasjunk plugin with its cmd_learn driver.\n\n## Affected\n\n- `webmail >= 1.6.0, < 1.6.18`\n- `webmail >= 1.7.0, < 1.7.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `webmail 1.7.3`","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}