{"id":"CVE-2026-108260","state":"PUBLISHED","title":"@tinacms/web-components: `tina-markdown` writes rich-text link URLs into `href` without scheme validation, allowing stored XSS","description":"Tina is a headless content management system. Prior to 0.2.1, the tina-markdown element in packages/@tinacms/web-components/src/tina-markdown.js assigns a rich-text node.url value directly to an anchor href without validating the URL scheme. A content author can store a link using a script-capable scheme, and a visitor who clicks the rendered link executes attacker-controlled script in the site's origin. The script can access same-origin application data and, when the visitor is an editor or administrator, may expose credentials stored by the TinaCMS admin on that origin. This issue is fixed in version 0.2.1.","publishedAt":"2026-10-09T20:40:37.228Z","updatedAt":"2026-10-13T15:17:14.297Z","severity":{"score":7.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["tinacms tinacms","@tinacms web-components"],"affected":[{"vendor":"tinacms","product":"tinacms","versions":[{"version":"< 3.14.0","status":"affected"}]},{"vendor":"@tinacms","product":"web-components","versions":[{"version":"< 0.2.1","status":"affected"}]}],"references":["https://github.com/tinacms/tinacms/security/advisories/GHSA-c42q-qvc3-j6vg","https://github.com/tinacms/tinacms/pull/7523","https://github.com/tinacms/tinacms/commit/5295e077f0d279c35686a0e481a15e33a4877e3b","https://github.com/tinacms/tinacms/releases/tag/@tinacms/web-components@0.2.1"],"weaknesses":["CWE-79","CWE-83"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/108xxx/CVE-2026-108260.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-108260","state":"PUBLISHED","datePublished":"2026-10-09T20:40:37.228Z","dateUpdated":"2026-10-13T15:17:14.297Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-09T17:33:15.409Z"},"containers":{"cna":{"title":"@tinacms/web-components: `tina-markdown` writes rich-text link URLs into `href` without scheme validation, allowing stored XSS","descriptions":[{"lang":"en","value":"Tina is a headless content management system. Prior to 0.2.1, the tina-markdown element in packages/@tinacms/web-components/src/tina-markdown.js assigns a rich-text node.url value directly to an anchor href without validating the URL scheme. A content author can store a link using a script-capable scheme, and a visitor who clicks the rendered link executes attacker-controlled script in the site's origin. The script can access same-origin application data and, when the visitor is an editor or administrator, may expose credentials stored by the TinaCMS admin on that origin. This issue is fixed in version 0.2.1."}],"affected":[{"vendor":"tinacms","product":"tinacms","versions":[{"version":"< 3.14.0","status":"affected"}]},{"vendor":"@tinacms","product":"web-components","versions":[{"version":"< 0.2.1","status":"affected"}]}],"references":[{"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-c42q-qvc3-j6vg","name":"https://github.com/tinacms/tinacms/security/advisories/GHSA-c42q-qvc3-j6vg","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/tinacms/tinacms/pull/7523","name":"https://github.com/tinacms/tinacms/pull/7523","tags":["x_refsource_MISC"]},{"url":"https://github.com/tinacms/tinacms/commit/5295e077f0d279c35686a0e481a15e33a4877e3b","name":"https://github.com/tinacms/tinacms/commit/5295e077f0d279c35686a0e481a15e33a4877e3b","tags":["x_refsource_MISC"]},{"url":"https://github.com/tinacms/tinacms/releases/tag/@tinacms/web-components@0.2.1","name":"https://github.com/tinacms/tinacms/releases/tag/@tinacms/web-components@0.2.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/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"}]},{"descriptions":[{"cweId":"CWE-83","lang":"en","description":"CWE-83: Improper Neutralization of Script in Attributes in a Web Page","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-09T20:40:37.228Z"},"source":{"advisory":"GHSA-c42q-qvc3-j6vg","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-c42q-qvc3-j6vg","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-13T15:17:02.736533Z","id":"CVE-2026-108260","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-13T15:17:14.297Z"}}]}}}