{"id":"CVE-2026-52798","summary":"Gogs: Stored XSS in `.ipynb` Preview","details":"Gogs is an open source self-hosted Git service. Prior to 0.14.3, although .ipynb previews are sanitized on the server side via /-/api/sanitize_ipynb, the inserted content is re-rendered on the client side without sanitization using marked() on elements with the .nb-markdown-cell class. During this process, links containing schemes such as javascript: can be regenerated. As a result, when a victim views an attacker-crafted .ipynb file and clicks the link, arbitrary JavaScript is executed in the Gogs origin, leading to a click-based Stored XSS. This vulnerability is fixed in 0.14.3.","aliases":["GHSA-jq8v-rmf6-65jw","GO-2026-5477"],"modified":"2026-08-12T03:51:38.798457763Z","published":"2026-06-24T20:14:13.965Z","related":["openSUSE-SU-2026:21483-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52798.json"},"references":[{"type":"WEB","url":"https://github.com/gogs/gogs/releases/tag/v0.14.3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52798.json"},{"type":"ADVISORY","url":"https://github.com/gogs/gogs/security/advisories/GHSA-jq8v-rmf6-65jw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52798"},{"type":"FIX","url":"https://github.com/gogs/gogs/commit/17b168b11ca759a7550e1f4bbd68bbde14db7785"},{"type":"FIX","url":"https://github.com/gogs/gogs/pull/8319"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/gogs/gogs","events":[{"introduced":"0"},{"fixed":"17b168b11ca759a7550e1f4bbd68bbde14db7785"},{"fixed":"3ba8aca90e17e5410b7e8b227c9f29256ac3e875"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"0.14.3"}]}}],"versions":["v0.14.2-rc.1","v0.14.2","v0.14.1-rc.1","v0.14.1","v0.14.0-rc.1","v0.14.0","latest-commit-build","v0.11.91","v0.11.86","v0.11.79","v0.11.66","v0.11.53","v0.11.43","v0.11.34","v0.11.33","v0.11.29","v0.11.19","v0.11.4","v0.11","v0.11rc","v0.10.18","v0.10.8","v0.10","v0.10rc","v0.9.141","v0.9.128","v0.9.113","v0.9.97","v0.9.71","v0.9.60","v0.9.48","v0.9.46","v0.9.13","v0.9.0","v0.8.43","v0.8.25","v0.8.10","v0.8.0","v0.7.33","v0.7.22","v0.7.19","v0.7.6","v0.7.0","v0.6.15","v0.6.9","v0.6.3","v0.6.1","v0.5.13","v0.5.11","v0.5.9","v0.5.8","v0.5.5","v0.5.2","v0.5.0","v0.4.2","v0.4.1","v0.4.0","v0.3.1","v0.3.0","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52798.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L"}]}