{"id":"CVE-2026-114720","kind":"vulnerability","aliases":["CVE-2026-114720"],"related":[],"title":"Roundcube Webmail: CRLF in mark action lets attackers run IMAP commands","description":"Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an IMAP command injection vulnerability. A remote authenticated attacker can exploit this via CRLF sequences injected into the _flag parameter of the mail/mark action to execute arbitrary IMAP commands. Upstream fixed this in the commit “Fix IMAP command injection via CRLF in `_flag` parameter of mail/mark action”, which rejects flags containing control, whitespace and IMAP-special characters.","summary":"Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 does not filter CRLF sequences in the _flag parameter of the mail/mark action. A logged-in user can inject arbitrary IMAP commands into the mailbox session on the mail server.","severity":"high","cvss":7.1,"epss":0.00805,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["imap","package","roundcube","self-hosted","webmail"],"not_affected_if":["no-user-accounts","patched-version"],"how_to_check":"- Check the installed Roundcube version in `CHANGELOG.md` or the `version` value in `program/include/iniset.php`, looking for anything below `1.6.20` or in the `1.7.x` line below `1.7.5`.\n- unknown whether the sources give a further check for the injected IMAP path.","fix":"- Upgrade Roundcube Webmail to `1.6.20` on the 1.6 line or `1.7.5` on the 1.7 line.\n- Apply the upstream commit “Fix IMAP command injection via CRLF in `_flag` parameter of mail/mark action”, which rejects flags containing control, whitespace and IMAP-special characters.","status":"open","published_at":"2026-10-22T02:16:59+00:00","first_seen_at":"2026-10-23T21:57:30+00:00","triaged_at":"2026-10-25T03:31:45+00:00","updated_at":"2026-10-25T03:31:45+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-25T03:31:45Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Roundcube Webmail to `1.6.20` on the 1.6 line or `1.7.5` on the 1.7 line.\n- Apply the upstream commit “Fix IMAP command injection via CRLF in `_flag` parameter of mail/mark action”, which rejects flags containing control, whitespace and IMAP-special characters.","reach":"internet","title":"Roundcube Webmail: CRLF in mark action lets attackers run IMAP commands","impact":"medium","summary":"Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 does not filter CRLF sequences in the _flag parameter of the mail/mark action. A logged-in user can inject arbitrary IMAP commands into the mailbox session on the mail server.","category":"package","nicknames":[],"who_cares":["roundcube","webmail","self-hosted","imap"],"confidence":0.7,"needs_auth":"yes","worst_case":"authenticated user runs arbitrary IMAP commands against the mail server","analyst_note":"Check the upstream Roundcube advisory and the linked commit for the exact affected version list and whether any IMAP command beyond mailbox access is reachable.","how_to_check":"- Check the installed Roundcube version in `CHANGELOG.md` or the `version` value in `program/include/iniset.php`, looking for anything below `1.6.20` or in the `1.7.x` line below `1.7.5`.\n- unknown whether the sources give a further check for the injected IMAP path.","needs_analyst":true,"not_affected_if":["patched-version","no-user-accounts"],"who_is_affected":"Any Roundcube Webmail deployment on a version before 1.6.20 or in the 1.7.x line before 1.7.5 is exposed. The attacker needs a valid mailbox login, so the risk is to shared or multi-tenant webmail where users are not fully trusted.","user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000691,"input_tokens":3444,"output_tokens":693,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-114720':14A,17A '-2026':13A,16A '1.6.20':28B,68C '1.7':30B,70C '1.7.5':33B,73C 'action':6A,46B,100C,123C 'affect':75C 'arbitrari':54B,103C 'attack':8A,85C 'authent':84C 'charact':134C 'command':11A,56B,79C,105C,114C 'commit':111C 'contain':127C 'control':128C 'crlf':3A,37B,90C,117C 'cve':12A,15A 'execut':102C 'exploit':87C 'filter':36B 'fix':107C,112C 'flag':41B,95C,119C,126C 'host':23B 'imap':10A,18B,55B,78C,104C,113C,132C 'imap-speci':131C 'inject':53B,80C,92C,115C 'let':7A 'log':49B 'logged-in':48B 'mail':63B 'mail/mark':45B,99C,122C 'mailbox':59B 'mark':5A 'packag':19B 'paramet':42B,96C,120C 'reject':125C 'remot':83C 'roundcub':1A,20B,25B,65C 'run':9A 'self':22B 'self-host':21B 'sequenc':38B,91C 'server':64B 'session':60B 'special':133C 'upstream':106C 'user':51B 'via':89C,116C 'vulner':81C 'webmail':2A,24B,26B,66C 'whitespac':129C 'x':31B,71C","nicknames":[],"mitigations":[],"who_affected":"Any Roundcube Webmail deployment on a version before 1.6.20 or in the 1.7.x line before 1.7.5 is exposed. The attacker needs a valid mailbox login, so the risk is to shared or multi-tenant webmail where users are not fully trusted.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-22T02:16:59+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","cvss_by":"cve@mitre.org","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-114720","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114720","severity":null,"published_at":"2026-10-22T02:16:59+00:00","modified_at":"2026-10-22T16:45:49+00:00","first_seen_at":"2026-10-23T21:57:30+00:00","fetched_at":"2026-10-23T22:29:02+00:00","note":null},{"source":"epss","external_id":"CVE-2026-114720","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-114720","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T07:15:52+00:00","fetched_at":"2026-10-24T07:15:52+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}