{"id":"CVE-2026-63205","title":"Zammad is a web based open source helpdesk/customer support system","summary":"Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, when creating or updating an email signature, Zammad processes inline images referenced in the signature body. If a signature body contains an HTML img t…","severity":"medium","cvss":5.1,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","cwe":["CWE-639","CWE-862"],"vendor":"zammad","product":"zammad","affected":["zammad < 7.1.2"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T19:17:54.837","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63205","references":[{"url":"https://github.com/zammad/zammad/commit/f3e4da83621efad8443a4e9fe6bd87befad47c44","label":"security-advisories@github.com"},{"url":"https://github.com/zammad/zammad/security/advisories/GHSA-pp8r-x7pp-5qj5","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"cvssSource":"cna","ingestedAt":"2026-09-25T19:15:39.035Z","slug":"CVE-2026-63205","body":"## Overview\n\nZammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, when creating or updating an email signature, Zammad processes inline images referenced in the signature body. If a signature body contains an HTML img tag pointing to any existing attachment, the system copies that attachment into a new signature-owned record, without checking whether the user has permission to access the original attachment. The newly created copy is then downloadable by the same channel-admin user, because attachment access is determined by the copy's owner (the signature), not the original object (e.g., a ticket or knowledge-base article). This allows a user with any of the admin.channel_email, admin.channel_google, admin.channel_microsoft365, or admin.channel_microsoft_graph permissions to read attachments they would otherwise be denied access to, such as ticket attachments belonging to groups they are not a member of. This issue is fixed in version 7.1.2.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":28.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}