{"answers":{"affected":"3 open source packages ship an affected version, including github.com/lin-snow/ech0.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-79670 exists.","fix":"Upgrade github.com/lin-snow/ech0 to 4.4.3 or later.","what":"CVE-2026-79670 is a medium-severity cross-site scripting vulnerability in lin-snow Ech0, published on 25 Aug 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-79670 and fix it if it is affected.\n\nWhat it is: CVE-2026-79670 is a medium-severity cross-site scripting vulnerability in lin-snow Ech0, published on 25 Aug 2026. An attacker needs administrator access to exploit it, 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-2026-79670 exists.\n\nAffected packages and fixed versions:\n- github.com/lin-snow/ech0 (Go): affected all versions; no fix listed\n- github.com/lin-snow/ech0 (Go): affected all versions; fixed in 4.4.3\n- github.com/lin-snow/ech0 (Go): affected all versions; fixed in 4.4.3\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-2026-79670/ (Markdown: https://insights.sbomify.com/CVE-2026-79670/index.md)","id":"CVE-2026-79670","markdown":"https://insights.sbomify.com/CVE-2026-79670/index.md","name":"CVE-2026-79670","record":{"aliases":["GHSA-69hx-63pv-f8f4","GHSA-mj42-9vh2-f8v3","GO-2026-5172"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Ech0 web application","requires_auth":"high_privilege","summary":"Admins can upload malicious SVG files causing stored XSS, allowing session hijacking and data exfiltration for any user.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":4.8,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-434","name":"Unrestricted Upload of File with Dangerous Type"}],"description":"Ech0 before 4.4.3 contains a stored cross-site scripting vulnerability in the file upload endpoint that validates Content-Type using only client-supplied headers without server-side inspection. Attackers with admin privileges can upload SVG or HTML files containing JavaScript that executes in the application origin when accessed by any user, enabling session hijacking and data exfiltration.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"Ech0 before 4.4.3 Stored XSS via SVG Upload","id":"CVE-2026-79670","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"Ech0 before 4.4.3 SSRF via DNS Resolution Bypass","id":"CVE-2026-79671"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/lin-snow/ech0","purl":"pkg:golang/github.com/lin-snow/ech0","source":"GO-2026-5172"},{"ecosystem":"Go","fixed":["4.4.3"],"introduced":["0"],"last_affected":[],"package":"github.com/lin-snow/ech0","purl":null,"source":"GHSA-69hx-63pv-f8f4"},{"ecosystem":"Go","fixed":["4.4.3"],"introduced":["0"],"last_affected":[],"package":"github.com/lin-snow/ech0","purl":"pkg:golang/github.com/lin-snow/ech0","source":"GHSA-69hx-63pv-f8f4"}],"prev":{"headline":"Ech0 before 4.4.3 Missing Authorization on System Logs","id":"CVE-2026-79669"},"products":["Ech0"],"published":"2026-08-25","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":"2026-08-25","vendors":["lin-snow"]},"summary":"Admins can upload malicious SVG files causing stored XSS, allowing session hijacking and data exfiltration for any user.","url":"https://insights.sbomify.com/CVE-2026-79670/"}