{"id":"CVE-2026-55424","state":"PUBLISHED","title":"Discourse: Topic featured link susceptible to stored XSS","description":"Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a topic \"featured link\" was not sufficiently normalized and escaped before being rendered in the topic list, allowing a user who can set a featured link to inject JavaScript when default Content Security Policy protections were modified or disabled. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.","publishedAt":"2026-07-09T22:01:22.249Z","updatedAt":"2026-07-10T14:40:09.311Z","severity":{"score":7.4,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["discourse discourse"],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"version":">= 2026.1.0-latest, < 2026.1.5","status":"affected"},{"version":">= 2026.4.0-latest, < 2026.4.2","status":"affected"},{"version":">= 2026.5.0-latest, < 2026.5.1","status":"affected"}]}],"references":["https://github.com/discourse/discourse/security/advisories/GHSA-695w-7fv8-mxg3","https://github.com/discourse/discourse/commit/1bce8881e4253d9bbab56f011a12ef899b926b59","https://github.com/discourse/discourse/commit/6679d9a5083488bae10c2adbb345c481c583242c","https://github.com/discourse/discourse/commit/6828aee9b15c2655d63b515ac919830bd540ff83","https://github.com/discourse/discourse/commit/c9b9405f5bd0bf0269e505e28e3aad388d7657c5","https://github.com/discourse/discourse/releases/tag/v2026.1.5","https://github.com/discourse/discourse/releases/tag/v2026.4.2","https://github.com/discourse/discourse/releases/tag/v2026.5.1","https://github.com/discourse/discourse/releases/tag/v2026.6.0"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55424.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55424","state":"PUBLISHED","datePublished":"2026-07-09T22:01:22.249Z","dateUpdated":"2026-07-10T14:40:09.311Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T21:48:43.126Z"},"containers":{"cna":{"title":"Discourse: Topic featured link susceptible to stored XSS","descriptions":[{"lang":"en","value":"Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a topic \"featured link\" was not sufficiently normalized and escaped before being rendered in the topic list, allowing a user who can set a featured link to inject JavaScript when default Content Security Policy protections were modified or disabled. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5."}],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"version":">= 2026.1.0-latest, < 2026.1.5","status":"affected"},{"version":">= 2026.4.0-latest, < 2026.4.2","status":"affected"},{"version":">= 2026.5.0-latest, < 2026.5.1","status":"affected"}]}],"references":[{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-695w-7fv8-mxg3","name":"https://github.com/discourse/discourse/security/advisories/GHSA-695w-7fv8-mxg3","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/discourse/discourse/commit/1bce8881e4253d9bbab56f011a12ef899b926b59","name":"https://github.com/discourse/discourse/commit/1bce8881e4253d9bbab56f011a12ef899b926b59","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/6679d9a5083488bae10c2adbb345c481c583242c","name":"https://github.com/discourse/discourse/commit/6679d9a5083488bae10c2adbb345c481c583242c","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/6828aee9b15c2655d63b515ac919830bd540ff83","name":"https://github.com/discourse/discourse/commit/6828aee9b15c2655d63b515ac919830bd540ff83","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/c9b9405f5bd0bf0269e505e28e3aad388d7657c5","name":"https://github.com/discourse/discourse/commit/c9b9405f5bd0bf0269e505e28e3aad388d7657c5","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.1.5","name":"https://github.com/discourse/discourse/releases/tag/v2026.1.5","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.4.2","name":"https://github.com/discourse/discourse/releases/tag/v2026.4.2","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.5.1","name":"https://github.com/discourse/discourse/releases/tag/v2026.5.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.6.0","name":"https://github.com/discourse/discourse/releases/tag/v2026.6.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"PASSIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"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":"2026-07-09T22:01:22.249Z"},"source":{"advisory":"GHSA-695w-7fv8-mxg3","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-10T14:39:57.512653Z","id":"CVE-2026-55424","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-10T14:40:09.311Z"}}]}}}