{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52816","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-08T18:11:06.660Z","datePublished":"2026-06-24T20:26:34.151Z","dateUpdated":"2026-06-25T20:22:33.493Z"},"containers":{"cna":{"title":"Gogs: Unauthenticated Jupyter Notebook (ipynb) Sanitizer allows arbitrary data: URIs leading to XSS","problemTypes":[{"descriptions":[{"cweId":"CWE-80","lang":"en","description":"CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:P","version":"4.0"}}],"references":[{"name":"https://github.com/gogs/gogs/security/advisories/GHSA-3w28-36p9-w929","tags":["x_refsource_CONFIRM"],"url":"https://github.com/gogs/gogs/security/advisories/GHSA-3w28-36p9-w929"},{"name":"https://github.com/gogs/gogs/pull/8326","tags":["x_refsource_MISC"],"url":"https://github.com/gogs/gogs/pull/8326"},{"name":"https://github.com/gogs/gogs/commit/dd1bd9837aa196b3ed3a8ee21e5727b5d7a986a3","tags":["x_refsource_MISC"],"url":"https://github.com/gogs/gogs/commit/dd1bd9837aa196b3ed3a8ee21e5727b5d7a986a3"},{"name":"https://github.com/gogs/gogs/releases/tag/v0.14.3","tags":["x_refsource_MISC"],"url":"https://github.com/gogs/gogs/releases/tag/v0.14.3"}],"affected":[{"vendor":"gogs","product":"gogs","versions":[{"version":"< 0.14.3","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-06-24T20:26:34.151Z"},"descriptions":[{"lang":"en","value":"Gogs is an open source self-hosted Git service. Prior to 0.14.3, the Jupyter Notebook (ipynb) sanitizer endpoint at POST /-/api/sanitize_ipynb allows arbitrary data: URIs without proper restrictions, potentially leading to Cross-Site Scripting (XSS). The endpoint uses bluemonday.UGCPolicy() with p.AllowURLSchemes(\"data\") which permits all data URI schemes including data:text/html, enabling attackers to inject malicious HTML/JavaScript. Additionally, the endpoint has no authentication middleware, allowing any registered user to exploit this vulnerability. This vulnerability is fixed in 0.14.3."}],"source":{"advisory":"GHSA-3w28-36p9-w929","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/gogs/gogs/security/advisories/GHSA-3w28-36p9-w929","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-25T20:19:34.243018Z","id":"CVE-2026-52816","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-06-25T20:22:33.493Z"}}]}}