{"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-2026-72809 exists.","fix":"Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260723031701-9c16e9851f0b or later.","what":"CVE-2026-72809 is a high-severity authentication bypass vulnerability in siyuan-note siyuan, published on 12 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-72809 and fix it if it is affected.\n\nWhat it is: CVE-2026-72809 is a high-severity authentication bypass vulnerability in siyuan-note siyuan, published on 12 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-72809 exists.\n\nAffected packages and fixed versions:\n- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260723031701-9c16e9851f0b\n- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260723031701-9c16e9851f0b\n- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260723031701-9c16e9851f0b\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-2026-72809/ (Markdown: https://insights.sbomify.com/CVE-2026-72809/index.md)","id":"CVE-2026-72809","markdown":"https://insights.sbomify.com/CVE-2026-72809/index.md","name":"CVE-2026-72809","record":{"aliases":["GHSA-3mp7-4rh5-jrv9","GO-2026-6386"],"analysis":{"component_type":"desktop_application","fix_type":"upgrade","impacts":["privilege_escalation","security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"SiYuan note-taking app","requires_auth":"none","summary":"Remote attackers can gain admin access via localhost trust bypass in SiYuan when using a fixed-port reverse proxy bound to a network interface.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-290","name":"Authentication Bypass by Spoofing"}],"description":"SiYuan versions \u003c= v3.7.2 (patched in v3.7.4) contain an authentication bypass vulnerability in the kernel's CheckAuth function, which grants the administrator role (RoleAdministrator) to any request whose RemoteAddr is loopback (127.0.0.1) for a specific set of endpoints (including /api/system/exit, getNetwork, getWorkspaceInfo, /assets/*, and /export/*). These localhost bypasses sit outside the access auth code gate, so they apply even when an access auth code is configured. Because the fixed-port reverse proxy forwards requests to the kernel over loopback without injecting an authentication token and does not configure trusted proxies, a request forwarded through this proxy reaches the kernel with RemoteAddr = 127.0.0.1. If the fixed-port proxy is bound to a network interface, this could allow a remote unauthenticated attacker to obtain admin access on the affected endpoints; however, per the advisory this remote forwarding behavior was established only by code inspection and was not reproduced end-to-end.","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 v3.7.4 Authentication Bypass via Localhost Trust","id":"CVE-2026-72809","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"SiYuan before v3.7.4 Publish-Boundary Bypass via WebSocket","id":"CVE-2026-72810"},"packages":[{"ecosystem":"Go","fixed":["0.0.0-20260723031701-9c16e9851f0b"],"introduced":["0"],"last_affected":[],"package":"github.com/siyuan-note/siyuan/kernel","purl":null,"source":"GHSA-3mp7-4rh5-jrv9"},{"ecosystem":"Go","fixed":["0.0.0-20260723031701-9c16e9851f0b"],"introduced":["0"],"last_affected":[],"package":"github.com/siyuan-note/siyuan/kernel","purl":"pkg:golang/github.com/siyuan-note/siyuan/kernel","source":"GHSA-3mp7-4rh5-jrv9"},{"ecosystem":"Go","fixed":["0.0.0-20260723031701-9c16e9851f0b"],"introduced":["0"],"last_affected":[],"package":"github.com/siyuan-note/siyuan/kernel","purl":"pkg:golang/github.com/siyuan-note/siyuan/kernel","source":"GO-2026-6386"}],"prev":{"headline":"SiYuan before v3.7.4 Information Disclosure via getFileAnnotation","id":"CVE-2026-72808"},"products":["siyuan"],"published":"2026-08-12","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":"2026-08-14","vendors":["siyuan-note"]},"summary":"Remote attackers can gain admin access via localhost trust bypass in SiYuan when using a fixed-port reverse proxy bound to a network interface.","url":"https://insights.sbomify.com/CVE-2026-72809/"}