{"answers":{"affected":"3 open source packages ship an affected version, including github.com/lin-snow/Ech0 and github.com/lin-snow/ech0.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-79662 exists.","fix":"Upgrade github.com/lin-snow/Ech0 to 1.4.8-0.20260503040728-a7e8b8e84bd1 or later.","what":"CVE-2026-79662 is a high-severity vulnerability in lin-snow Ech0, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-79662 and fix it if it is affected.\n\nWhat it is: CVE-2026-79662 is a high-severity vulnerability in lin-snow Ech0, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, 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-2026-79662 exists.\n\nAffected packages and fixed versions:\n- github.com/lin-snow/Ech0 (Go): affected all versions; fixed in 1.4.8-0.20260503040728-a7e8b8e84bd1\n- github.com/lin-snow/Ech0 (Go): affected all versions; fixed in 1.4.8-0.20260503040728-a7e8b8e84bd1\n- github.com/lin-snow/ech0 (Go): affected all versions; fixed in 1.4.8-0.20260503040728-a7e8b8e84bd1\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-2026-79662/ (Markdown: https://insights.sbomify.com/CVE-2026-79662/index.md)","id":"CVE-2026-79662","markdown":"https://insights.sbomify.com/CVE-2026-79662/index.md","name":"CVE-2026-79662","record":{"aliases":["GHSA-m5w8-4879-f4pc","GHSA-p64j-f4x9-wq66","GO-2026-5531"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Ech0 authentication service","requires_auth":"none","summary":"Attackers can bypass OAuth redirect validation to steal authorization codes, leading to account takeover and token theft.","user_interaction":"required","vuln_class":"open_redirect"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"}],"description":"Ech0 through 4.5.6 contains an OAuth redirect URI validation vulnerability in parseAndValidateClientRedirect (internal/service/auth/auth.go) that compares only the scheme and host of the client-supplied redirect_uri against the admin-configured allowlist, ignoring path, query, and fragment components. The redirect_uri is embedded into the signed state JWT at login time without validation. An attacker can craft a redirect_uri whose host matches an allowed origin but whose path is attacker-influenced; after the OAuth exchange the victim is redirected to that path with a one-time exchange code in the query string. If the code leaks (e.g., via Referer, analytics, or an open redirect on that host), the attacker can trade it at the public POST /api/auth/exchange endpoint for the victim's access and refresh tokens. Fixed in 4.7.3.","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":"Ech0 before 4.7.3 OAuth Redirect URI Validation Bypass","id":"CVE-2026-79662","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"open_redirect","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"Ech0 before 4.7.3 Stored XSS via RSS feed tag names","id":"CVE-2026-79663"},"packages":[{"ecosystem":"Go","fixed":["1.4.8-0.20260503040728-a7e8b8e84bd1"],"introduced":["0"],"last_affected":[],"package":"github.com/lin-snow/Ech0","purl":null,"source":"GHSA-p64j-f4x9-wq66"},{"ecosystem":"Go","fixed":["1.4.8-0.20260503040728-a7e8b8e84bd1"],"introduced":["0"],"last_affected":[],"package":"github.com/lin-snow/Ech0","purl":"pkg:golang/github.com/lin-snow/Ech0","source":"GHSA-p64j-f4x9-wq66"},{"ecosystem":"Go","fixed":["1.4.8-0.20260503040728-a7e8b8e84bd1"],"introduced":["0"],"last_affected":[],"package":"github.com/lin-snow/ech0","purl":"pkg:golang/github.com/lin-snow/ech0","source":"GO-2026-5531"}],"prev":{"headline":"Ech0 before 4.7.3 Unauthenticated fav_count Modification","id":"CVE-2026-79661"},"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":"total"},"state":"PUBLISHED","updated":"2026-08-25","vendors":["lin-snow"]},"summary":"Attackers can bypass OAuth redirect validation to steal authorization codes, leading to account takeover and token theft.","url":"https://insights.sbomify.com/CVE-2026-79662/"}