{"id":"CVE-2021-43842","state":"PUBLISHED","title":"Stored XSS via SVG file upload in Wiki.js","description":"Wiki.js is a wiki app built on Node.js. Wiki.js versions 2.5.257 and earlier are vulnerable to stored cross-site scripting through a SVG file upload. By creating a crafted SVG file, a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the SVG is viewed directly by other users. Scripts do not execute when loaded inside a page via normal `<img>` tags. Commit 5d3e81496fba1f0fbd64eeb855f30f69a9040718 fixes this vulnerability by adding an optional (enabled by default) SVG sanitization step to all file uploads that match the SVG mime type. As a workaround, disable file upload for all non-trusted users. Wiki.js version 2.5.260 is the first production version to contain a patch. Version 2.5.258 is the first development build to contain a patch and is available only as a Docker image as requarks/wiki:canary-2.5.258.","publishedAt":"2021-12-20T22:30:11.000Z","updatedAt":"2024-08-04T04:10:16.396Z","severity":{"score":5.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["Requarks wiki"],"affected":[{"vendor":"Requarks","product":"wiki","versions":[{"version":"< 2.5.258 (development)","status":"affected"},{"version":"< 2.5.260 (production)","status":"affected"}]}],"references":["https://github.com/Requarks/wiki/security/advisories/GHSA-3qv4-gp35-rgh7","https://github.com/Requarks/wiki/commit/5d3e81496fba1f0fbd64eeb855f30f69a9040718","https://github.com/Requarks/wiki/releases/tag/2.5.260"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T19:49:07.642Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/43xxx/CVE-2021-43842.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-43842","state":"PUBLISHED","datePublished":"2021-12-20T22:30:11.000Z","dateUpdated":"2024-08-04T04:10:16.396Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2021-11-16T00:00:00.000Z"},"containers":{"cna":{"title":"Stored XSS via SVG file upload in Wiki.js","descriptions":[{"lang":"en","value":"Wiki.js is a wiki app built on Node.js. Wiki.js versions 2.5.257 and earlier are vulnerable to stored cross-site scripting through a SVG file upload. By creating a crafted SVG file, a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the SVG is viewed directly by other users. Scripts do not execute when loaded inside a page via normal `<img>` tags. Commit 5d3e81496fba1f0fbd64eeb855f30f69a9040718 fixes this vulnerability by adding an optional (enabled by default) SVG sanitization step to all file uploads that match the SVG mime type. As a workaround, disable file upload for all non-trusted users. Wiki.js version 2.5.260 is the first production version to contain a patch. Version 2.5.258 is the first development build to contain a patch and is available only as a Docker image as requarks/wiki:canary-2.5.258."}],"affected":[{"vendor":"Requarks","product":"wiki","versions":[{"version":"< 2.5.258 (development)","status":"affected"},{"version":"< 2.5.260 (production)","status":"affected"}]}],"references":[{"url":"https://github.com/Requarks/wiki/security/advisories/GHSA-3qv4-gp35-rgh7","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/Requarks/wiki/commit/5d3e81496fba1f0fbd64eeb855f30f69a9040718","tags":["x_refsource_MISC"]},{"url":"https://github.com/Requarks/wiki/releases/tag/2.5.260","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","dateUpdated":"2021-12-20T22:30:11.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa"},"source":{"advisory":"GHSA-3qv4-gp35-rgh7","discovery":"UNKNOWN"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-43842","STATE":"PUBLIC","TITLE":"Stored XSS via SVG file upload in Wiki.js"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"wiki","version":{"version_data":[{"version_value":"< 2.5.258 (development)"},{"version_value":"< 2.5.260 (production)"}]}}]},"vendor_name":"Requarks"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Wiki.js is a wiki app built on Node.js. Wiki.js versions 2.5.257 and earlier are vulnerable to stored cross-site scripting through a SVG file upload. By creating a crafted SVG file, a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the SVG is viewed directly by other users. Scripts do not execute when loaded inside a page via normal `<img>` tags. Commit 5d3e81496fba1f0fbd64eeb855f30f69a9040718 fixes this vulnerability by adding an optional (enabled by default) SVG sanitization step to all file uploads that match the SVG mime type. As a workaround, disable file upload for all non-trusted users. Wiki.js version 2.5.260 is the first production version to contain a patch. Version 2.5.258 is the first development build to contain a patch and is available only as a Docker image as requarks/wiki:canary-2.5.258."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}]},"references":{"reference_data":[{"name":"https://github.com/Requarks/wiki/security/advisories/GHSA-3qv4-gp35-rgh7","refsource":"CONFIRM","url":"https://github.com/Requarks/wiki/security/advisories/GHSA-3qv4-gp35-rgh7"},{"name":"https://github.com/Requarks/wiki/commit/5d3e81496fba1f0fbd64eeb855f30f69a9040718","refsource":"MISC","url":"https://github.com/Requarks/wiki/commit/5d3e81496fba1f0fbd64eeb855f30f69a9040718"},{"name":"https://github.com/Requarks/wiki/releases/tag/2.5.260","refsource":"MISC","url":"https://github.com/Requarks/wiki/releases/tag/2.5.260"}]},"source":{"advisory":"GHSA-3qv4-gp35-rgh7","discovery":"UNKNOWN"}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://github.com/Requarks/wiki/security/advisories/GHSA-3qv4-gp35-rgh7","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://github.com/Requarks/wiki/commit/5d3e81496fba1f0fbd64eeb855f30f69a9040718","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://github.com/Requarks/wiki/releases/tag/2.5.260","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T04:10:16.396Z"}}]}}}