{"id":"CVE-2026-40875","summary":"mailcow: dockerized vulnerable to stored XSS in user login history real_rip","details":"mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the user dashboard's \"Seen successful connections\" (login history) renders the client IP from login logs without HTML escaping. Because the server trusts the X-Real-IP header as the source IP for logging, an attacker can inject HTML/JS into this field. This Self-XSS can be exploited by a Login CSRF to force the victim into the attacker's account, and then read emails in a previous browser tab. Version 2026-03b fixes the vulnerability.","aliases":["GHSA-jprq-w83q-q62h"],"modified":"2026-07-08T08:13:12.902073896Z","published":"2026-04-21T19:19:55.768Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40875.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-79","CWE-80"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40875.json"},{"type":"ADVISORY","url":"https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-jprq-w83q-q62h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40875"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mailcow/mailcow-dockerized","events":[{"introduced":"0"},{"fixed":"281cf93db359554e8f4ca941351d5ba157325cc7"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2026-03b"}],"source":"AFFECTED_FIELD"}}],"versions":["2026-03a","2026-03","2026-01","2025-12a","2025-12","2025-10a","2025-10","2025-09c","2025-09b","2025-09a","2025-09","2025-07","2025-05","2025-03b","2025-03a","2025-03","2025-02","2025-01a","2025-01","2024-11b","2024-11a","2024-11","2024-08a","2024-08","2024-07","2024-06c","2024-06b","2024-06a","2024-06","2024-04","2024-02","2024-01e","2024-01d","2024-01c","2024-01b","2024-01a","2024-01","2023-12a","2023-12","2023-11a","2023-11","2023-10a","2023-10","2023-09","2023-08","2023-07a","2023-07","2023-05a","2023-05","2023-04b","2023-04a","2023-04","2023-03","2023-02a","2023-02","2023-01a","2023-01","2022-12b","2022-12a","2022-12","2022-11b","2022-11a","2022-11","2022-10a","2022-10","2022-09a","2022-09","2022-08b","2022-08a","2022-08","2022-07a","2022-07","2022-06b","2022-06a","2022-06","2022-05d","2022-05c","2022-05b","2022-05a","2022-05","2022-03a","2022-03","2022-01a","2022-01"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40875.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:N/VA:N/SC:H/SI:H/SA:N"}]}