{"id":"CVE-2026-48164","state":"PUBLISHED","title":"Collabora Online: Reflected HTML injection through host_session_id","description":"Collabora Online is a collaborative online office suite based on LibreOffice technology. Prior to 24.04.18 and 25.04.11, the `host_session_id` query/form parameter is substituted into the `cool.html` editor page without HTML encoding, unlike parameters passed through the existing variable-encoding mechanism. An attacker who induces a victim to load a crafted URL can inject HTML and, in the absence of an effective `Content Security Policy`, execute scripts in the Collabora Online iframe's origin, exposing the session authentication token and page contents. A reverse proxy that preserves the `Content Security Policy` header sent by `coolwsd` mitigates the script-execution scenario. This issue is fixed in versions 24.04.18 and 25.04.11.","publishedAt":"2026-10-30T14:57:18.378Z","updatedAt":"2026-10-30T15:44:29.766Z","severity":{"score":4.7,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["CollaboraOnline online"],"affected":[{"vendor":"CollaboraOnline","product":"online","versions":[{"version":"< 24.04.18","status":"affected"},{"version":">= 25.04.0-0, < 25.04.11","status":"affected"}]}],"references":["https://github.com/CollaboraOnline/online/security/advisories/GHSA-wgmm-q3ch-64jj","https://github.com/CollaboraOnline/online/commit/2d4469d27f0c52f4b28b64090e60452d2e147279"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-30T15:52:06.342Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/48xxx/CVE-2026-48164.json","commit":"e38f713043e354157a039ed59396319d18b4445f","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-48164","state":"PUBLISHED","datePublished":"2026-10-30T14:57:18.378Z","dateUpdated":"2026-10-30T15:44:29.766Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-20T23:12:43.032Z"},"containers":{"cna":{"title":"Collabora Online: Reflected HTML injection through host_session_id","descriptions":[{"lang":"en","value":"Collabora Online is a collaborative online office suite based on LibreOffice technology. Prior to 24.04.18 and 25.04.11, the `host_session_id` query/form parameter is substituted into the `cool.html` editor page without HTML encoding, unlike parameters passed through the existing variable-encoding mechanism. An attacker who induces a victim to load a crafted URL can inject HTML and, in the absence of an effective `Content Security Policy`, execute scripts in the Collabora Online iframe's origin, exposing the session authentication token and page contents. A reverse proxy that preserves the `Content Security Policy` header sent by `coolwsd` mitigates the script-execution scenario. This issue is fixed in versions 24.04.18 and 25.04.11."}],"affected":[{"vendor":"CollaboraOnline","product":"online","versions":[{"version":"< 24.04.18","status":"affected"},{"version":">= 25.04.0-0, < 25.04.11","status":"affected"}]}],"references":[{"url":"https://github.com/CollaboraOnline/online/security/advisories/GHSA-wgmm-q3ch-64jj","name":"https://github.com/CollaboraOnline/online/security/advisories/GHSA-wgmm-q3ch-64jj","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/CollaboraOnline/online/commit/2d4469d27f0c52f4b28b64090e60452d2e147279","name":"https://github.com/CollaboraOnline/online/commit/2d4469d27f0c52f4b28b64090e60452d2e147279","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-30T14:57:18.378Z"},"source":{"advisory":"GHSA-wgmm-q3ch-64jj","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-30T15:44:14.478525Z","id":"CVE-2026-48164","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-30T15:44:29.766Z"}}]}}}