{"id":"CVE-2026-50290","revision":"e169e6b32732400ca6cc07a5217d93fb","records":[{"revision":"e169e6b32732400ca6cc07a5217d93fb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-50290","aliases":[],"title":"@asymmetric-effort/specifyjs: CSS expression sanitization is bypassable in renderToString","description":"SpecifyJS is a declarative TypeScript user interface framework. Prior to version 0.2.136, CSS value sanitization stripped `expression(` and `url(javascript:` using simple regex, but could be bypassed with CSS unicode escapes (`\\65xpression(`), null bytes, or CSS comments (`exp/**/ression(`). These CSS injection vectors only work in legacy browsers (IE6-IE10). SpecifyJS targets modern browsers. Starting in version 0.2.136, CSS sanitization now normalizes unicode escapes and strips CSS comments before pattern matching. Also checks for `behavior:`, `-moz-binding`, and `-o-link` patterns.","state":0,"publishedAt":"2026-08-21T19:55:51.086+00:00","modifiedAt":"2026-08-21T20:07:10.712+00:00","affected":[{"ecosystem":"Vendor product","name":"specifyjs","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"asymmetric-effort\",\n                    \"product\": \"specifyjs\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.2.136\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/asymmetric-effort/specifyjs/security/advisories/GHSA-93q6-wwjh-jc6h","https://github.com/asymmetric-effort/specifyjs/commit/25d1fb491d99479efdf501f5f75e0bb80c908f0a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-50290","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-50290","identifiers":["CVE-2026-50290"]},"retained":false,"historicalAffected":[]}],"coverage":[]}