{"answers":{"affected":"1 open source package ship an affected version, including ash_authentication_oauth2_server.","exploited":"There is no known exploitation of CVE-2026-82758 in the wild and no public exploit code.","fix":"Upgrade ash_authentication_oauth2_server to 0.3.1 or later.","what":"CVE-2026-82758 is a medium-severity authentication bypass vulnerability in ash-project ash_authentication_oauth2_server, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-82758 and fix it if it is affected.\n\nWhat it is: CVE-2026-82758 is a medium-severity authentication bypass vulnerability in ash-project ash_authentication_oauth2_server, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-82758 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- ash_authentication_oauth2_server (Hex): affected from 0.1.0; fixed in 0.3.1\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-2026-82758/ (Markdown: https://insights.sbomify.com/CVE-2026-82758/index.md)","id":"CVE-2026-82758","markdown":"https://insights.sbomify.com/CVE-2026-82758/index.md","name":"CVE-2026-82758","record":{"aliases":["EEF-CVE-2026-82758","GHSA-fxc6-vp68-87pw"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Elixir OAuth2 library","requires_auth":"none","summary":"An unauthenticated attacker can register OAuth clients by exploiting a fail-open logic flaw in secret resolution, bypassing initial access token requirements.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"EEF","cpe":[],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-287","name":"Improper Authentication"}],"description":"Improper Authentication vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to register OAuth clients even when Dynamic Client Registration is gated by an initial access token.\n\nresolve_secret/3 in AshAuthentication.Oauth2Server (reached through __resolve_secret__!) treated any return other than {:ok, _} or :error from a configured {module, function, args} or 2-arity-function secret provider as a valid secret, wrapping nil, false, or \"\" as {:ok, value}. When the initial_access_token resolves to such an empty value, POST /oauth/register compares the presented bearer token against it and the comparison passes with no token supplied, so registration is open although it was configured closed. The same fail-open affected other resolved secrets such as signing_secret.\n\nThis issue affects ash_authentication_oauth2_server: from 0.1.0 before 0.3.1.","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":"Auth bypass in ash authentication oauth2 server","id":"CVE-2026-82758","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Hex","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":1,"n_references":4,"next":{"headline":"Reversible IP address pseudonymisation in AshAuthentication audit log hash mode","id":"CVE-2026-82759"},"packages":[{"ecosystem":"Hex","fixed":["0.3.1"],"introduced":["0.1.0"],"last_affected":[],"package":"ash_authentication_oauth2_server","purl":"pkg:hex/ash_authentication_oauth2_server","source":"EEF-CVE-2026-82758"}],"prev":{"headline":"ash_authentication_oauth2_server CIMD fetcher classifies IPv4-in-IPv6 and site-local addresses as public, allowing SSRF","id":"CVE-2026-82757"},"products":["ash_authentication_oauth2_server"],"published":"2026-09-07","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":"partial"},"state":"PUBLISHED","updated":"2026-09-08","vendors":["ash-project"]},"summary":"An unauthenticated attacker can register OAuth clients by exploiting a fail-open logic flaw in secret resolution, bypassing initial access token requirements.","url":"https://insights.sbomify.com/CVE-2026-82758/"}