{"id":"CVE-2026-27645","state":"PUBLISHED","title":"changedetection.io Vulnerable to Reflected XSS in RSS Single Watch Error Response","description":"changedetection.io is a free open source web page change detection tool. In versions prior to 0.54.1, the RSS single-watch endpoint reflects the UUID path parameter directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser parses and executes injected JavaScript. Version 0.54.1 contains a fix for the issue.","publishedAt":"2026-02-25T04:06:58.183Z","updatedAt":"2026-02-25T14:55:58.413Z","severity":{"score":6.1,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["dgtlmoon changedetection.io"],"affected":[{"vendor":"dgtlmoon","product":"changedetection.io","versions":[{"version":"< 0.54.1","status":"affected"}]}],"references":["https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-mw8m-398g-h89w","https://github.com/dgtlmoon/changedetection.io/commit/a385c89abf44b52fcfa20c7c6a6dd3047c4c1eb5"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/27xxx/CVE-2026-27645.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27645","state":"PUBLISHED","datePublished":"2026-02-25T04:06:58.183Z","dateUpdated":"2026-02-25T14:55:58.413Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-20T22:02:30.029Z"},"containers":{"cna":{"title":"changedetection.io Vulnerable to Reflected XSS in RSS Single Watch Error Response","descriptions":[{"lang":"en","value":"changedetection.io is a free open source web page change detection tool. In versions prior to 0.54.1, the RSS single-watch endpoint reflects the UUID path parameter directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser parses and executes injected JavaScript. Version 0.54.1 contains a fix for the issue."}],"affected":[{"vendor":"dgtlmoon","product":"changedetection.io","versions":[{"version":"< 0.54.1","status":"affected"}]}],"references":[{"url":"https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-mw8m-398g-h89w","name":"https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-mw8m-398g-h89w","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/dgtlmoon/changedetection.io/commit/a385c89abf44b52fcfa20c7c6a6dd3047c4c1eb5","name":"https://github.com/dgtlmoon/changedetection.io/commit/a385c89abf44b52fcfa20c7c6a6dd3047c4c1eb5","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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":"2026-02-25T04:06:58.183Z"},"source":{"advisory":"GHSA-mw8m-398g-h89w","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-mw8m-398g-h89w","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-25T14:55:52.211770Z","id":"CVE-2026-27645","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":"2026-02-25T14:55:58.413Z"}}]}}}