{"answers":{"affected":"1 open source package ship an affected version, including ash_authentication.","exploited":"There is no known exploitation of CVE-2026-86688 in the wild and no public exploit code.","fix":"Upgrade ash_authentication to a fixed version for your release line: 4.15.0 or 5.0.0-rc.14.","what":"CVE-2026-86688 is a high-severity authentication bypass vulnerability in team-alembic ash_authentication, published on 17 Sep 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-2026-86688 and fix it if it is affected.\n\nWhat it is: CVE-2026-86688 is a high-severity authentication bypass vulnerability in team-alembic ash_authentication, published on 17 Sep 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: There is no known exploitation of CVE-2026-86688 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- ash_authentication (Hex): affected from 0.2.0; fixed in 4.15.0, 5.0.0-rc.14\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-2026-86688/ (Markdown: https://insights.sbomify.com/CVE-2026-86688/index.md)","id":"CVE-2026-86688","markdown":"https://insights.sbomify.com/CVE-2026-86688/index.md","name":"CVE-2026-86688","record":{"aliases":["EEF-CVE-2026-86688","GHSA-v577-944g-7h3x"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Elixir authentication library","requires_auth":"none","summary":"Attackers can hijack user accounts by planting session identifiers that persist after login due to missing session renewal in ash_authentication.","user_interaction":"required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"EEF","cpe":[],"cvss":{"score":7.4,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-384","name":"Session Fixation"}],"description":"Session Fixation vulnerability in team-alembic ash_authentication allows an attacker who can plant a session identifier in a victim's browser to hold an authenticated session once that victim signs in.\n\nAshAuthentication.Plug.Helpers.store_in_session/2 writes the authenticated subject into the existing session with Plug.Conn.put_session/3 and never calls Plug.Conn.configure_session(renew: true), so the identifier the visitor arrived with carries into their authenticated session. Every authentication event reaches this one function: the default success/4 injected by AshAuthentication.Phoenix.Controller.__using__/1, the AuthController emitted by mix ash_authentication_phoenix.install, and remember-me auto-login. AshAuthentication.Phoenix.Plug.store_in_session/2 is a defdelegate to it. Logout does not close the window either, because clear_session/2 ends with Plug.Conn.clear_session/1, which clears session contents but leaves the identifier intact, so a planted identifier survives a logout-then-login cycle.\n\nThis issue affects ash_authentication: from 0.2.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.","ecosystems":["Hex"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Session id is not renewed on authentication in ash_authentication, allowing session fixation","id":"CVE-2026-86688","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Hex","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":1,"n_references":6,"next":{"headline":"Cleartext Transmission of Sensitive Information in Bransys ELD","id":"CVE-2026-86689"},"packages":[{"ecosystem":"Hex","fixed":["4.15.0","5.0.0-rc.14"],"introduced":["0.2.0","5.0.0-rc.0"],"last_affected":[],"package":"ash_authentication","purl":"pkg:hex/ash_authentication","source":"EEF-CVE-2026-86688"}],"prev":{"headline":"Gitea push mirror local path check uses the repository owner","id":"CVE-2026-86684"},"products":["ash_authentication"],"published":"2026-09-17","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Erlang Ecosystem Foundation","prefix":"EEF"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-18","vendors":["team-alembic"]},"summary":"Attackers can hijack user accounts by planting session identifiers that persist after login due to missing session renewal in ash_authentication.","url":"https://insights.sbomify.com/CVE-2026-86688/"}