{"answers":{"affected":"3 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66394 exists.","fix":"Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260714095344-f08dee71ba8e or later.","what":"CVE-2026-66394 is a critical cross-site scripting vulnerability in siyuan-note siyuan, published on 27 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-66394 and fix it if it is affected.\n\nWhat it is: CVE-2026-66394 is a critical cross-site scripting vulnerability in siyuan-note siyuan, published on 27 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66394 exists.\n\nAffected packages and fixed versions:\n- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260714095344-f08dee71ba8e\n- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260714095344-f08dee71ba8e\n- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260714095344-f08dee71ba8e\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-66394/ (Markdown: https://insights.sbomify.com/CVE-2026-66394/index.md)","id":"CVE-2026-66394","markdown":"https://insights.sbomify.com/CVE-2026-66394/index.md","name":"CVE-2026-66394","record":{"aliases":["GHSA-5p6m-3744-5c8g","GHSA-99rq-75j6-5j9f","GO-2026-6364"],"analysis":{"component_type":"desktop_application","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"SiYuan note-taking app","requires_auth":"low_privilege","summary":"Authenticated attackers can execute arbitrary scripts in SiYuan by bypassing SVG sanitization, potentially compromising user sessions and data.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":9.3,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"SiYuan before v3.7.3 contains stored and reflected cross-site scripting vulnerabilities in SVG sanitization that allows authenticated attackers to execute scripts by bypassing the HTML parser-based cleaner. Attackers can hide script tags within desc, style, or noscript elements which the HTML parser treats as raw text but browsers interpret as executable SVG content when served as image/svg+xml, enabling script execution in the application origin.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"SiYuan before v3.7.3 Stored and Reflected XSS via SVG Sanitizer Bypass","id":"CVE-2026-66394","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"SiYuan Desktop before v3.7.2 Reflected XSS to RCE via siyuan Protocol","id":"CVE-2026-66395"},"packages":[{"ecosystem":"Go","fixed":["0.0.0-20260714095344-f08dee71ba8e"],"introduced":["0"],"last_affected":[],"package":"github.com/siyuan-note/siyuan/kernel","purl":null,"source":"GHSA-99rq-75j6-5j9f"},{"ecosystem":"Go","fixed":["0.0.0-20260714095344-f08dee71ba8e"],"introduced":["0"],"last_affected":[],"package":"github.com/siyuan-note/siyuan/kernel","purl":"pkg:golang/github.com/siyuan-note/siyuan/kernel","source":"GHSA-99rq-75j6-5j9f"},{"ecosystem":"Go","fixed":["0.0.0-20260714095344-f08dee71ba8e"],"introduced":["0"],"last_affected":[],"package":"github.com/siyuan-note/siyuan/kernel","purl":"pkg:golang/github.com/siyuan-note/siyuan/kernel","source":"GO-2026-6364"}],"prev":{"headline":"NLTK before 3.9.4 Denial of Service via JSONTaggedDecoder","id":"CVE-2026-66393"},"products":["siyuan"],"published":"2026-07-27","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["siyuan-note"]},"summary":"Authenticated attackers can execute arbitrary scripts in SiYuan by bypassing SVG sanitization, potentially compromising user sessions and data.","url":"https://insights.sbomify.com/CVE-2026-66394/"}