{"schema_version":"1","data":[{"id":3978,"advisory_id":"21c4d789-bfcf-44a0-8895-c86b4d7765d0","revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-63205","source_published_at":"2026-09-25T18:13:25.176+00:00","published_at":"2026-10-24T21:44:33.999117+00:00","extraction_method":"structured","technologies":["core-cve","zammad"],"cve_ids":["CVE-2026-63205"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"Zammad: Channel admins can read unauthorized attachments via signature rich-text body","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 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.","evidence":"cve:CVE-2026-63205","products":[{"name":{"value":"zammad","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"medium","structured":{"id":"CVE-2026-63205","aliases":["CVE-2026-63205"],"metrics":[{"cvssV4_0":{"version":"4.0","baseScore":5.1,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"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","userInteraction":"NONE","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"HIGH","subIntegrityImpact":"NONE","vulnIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","vulnConfidentialityImpact":"LOW"}}],"affected":[{"vendor":"zammad","product":"zammad","versions":[{"status":"affected","version":"< 7.1.2"}]}],"modified":"2026-09-29T19:40:34.778Z","provider":"cve","references":["https://github.com/zammad/zammad/security/advisories/GHSA-pp8r-x7pp-5qj5","https://github.com/zammad/zammad/commit/f3e4da83621efad8443a4e9fe6bd87befad47c44"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-63205","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-29T19:40:24.888341Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-29T19:40:34.778Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-25T18:13:25.176Z"}}},"related_cves":[{"value":"CVE-2026-63205","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"}}],"next_after":3978,"next_before":3978}