{"id":"CVE-2026-3472","summary":"Markdown image rendering bypass in AI bot tool result posts in Mattermost","details":"Mattermost versions 10.11.x \u003c= 10.11.18, 11.6.x \u003c= 11.6.3, 11.5.x \u003c= 11.5.6 fail to properly apply markdown image rendering restrictions to AI bot tool result posts, which allows an authenticated attacker to exfiltrate data to an attacker-controlled server via injecting markdown image syntax into tool result content rendered by a victim's client.. Mattermost Advisory ID: MMSA-2026-00619","modified":"2026-07-15T01:48:59.217209976Z","published":"2026-06-26T14:42:24.154Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"10.11.0"},{"last_affected":"10.11.18"},{"introduced":"11.6.0"},{"last_affected":"11.6.3"},{"introduced":"11.5.0"},{"last_affected":"11.5.6"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"Mattermost","cwe_ids":["CWE-693"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3472.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3472.json"},{"type":"ADVISORY","url":"https://mattermost.com/security-updates"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3472"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost","events":[{"introduced":"5b955468ea1ea8b56c0fb10feb258a36a767d7bb"},{"fixed":"4439c6121d009e1b7a16bad504e62627572cf157"},{"introduced":"9f2616376582893035a7e3cb38b0fab648bba4e8"},{"fixed":"7395f2ba2f17aa328fde4856101bb927aa80dc1f"},{"introduced":"d4f4e78835e86e2e76f76bfe797623076f5c9835"},{"fixed":"374d6843170180aea130e92a4925b26cbdafca5d"}],"database_specific":{"extracted_events":[{"introduced":"10.11.0"},{"fixed":"10.11.19"},{"introduced":"11.5.0"},{"fixed":"11.5.7"},{"introduced":"11.6.0"},{"fixed":"11.6.4"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*"}}],"versions":["v10.11.19-rc1","v11.6.3","v10.11.18","v11.5.6","v11.6.2","v11.5.5","v10.11.17","v10.11.16","v10.11.15-rc1","v10.11.15","v11.5.4","v11.6.1-rc1","v11.6.1","v11.5.3","v10.11.14","v11.5.2-rc3","v11.5.2","v11.6.0","v10.11.14-rc1","v11.5.0","v11.5.2-rc2","v11.5.2-rc1","v10.11.13","v11.5.1","v10.11.13-rc1","v10.11.12","v10.11.11-rc2","v10.11.11","v10.11.11-rc1","v10.11.10","v10.11.9","v10.11.9-rc1","v10.11.8","v10.11.7","v10.11.6","v10.11.5","v10.11.4-rc3","v10.11.4","v10.11.4-rc2","v10.11.4-rc1","v10.11.3","v10.11.2-rc2","v10.11.2","v10.11.2-rc1","v10.11.1","v10.11.1-rc1","v10.11.0-rc3","v10.11.0","mattermost-redux@10.11.0","@mattermost/types@10.11.0","@mattermost/client@10.11.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3472.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N"}]}