{"answers":{"affected":"3 open source packages ship an affected version, including github.com/tinyauthapp/tinyauth.","exploited":"There is no known exploitation of CVE-2026-77560 in the wild and no public exploit code.","fix":"Upgrade github.com/tinyauthapp/tinyauth to 1.0.1-0.20260720133915-80bc87188ec3 or later.","what":"CVE-2026-77560 is a high-severity authentication bypass vulnerability in tinyauthapp tinyauth, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-77560 and fix it if it is affected.\n\nWhat it is: CVE-2026-77560 is a high-severity authentication bypass vulnerability in tinyauthapp tinyauth, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-77560 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/tinyauthapp/tinyauth (Go): affected all versions; fixed in 1.0.1-0.20260720133915-80bc87188ec3\n- github.com/tinyauthapp/tinyauth (Go): affected all versions; fixed in 1.0.1-0.20260720133915-80bc87188ec3\n- github.com/tinyauthapp/tinyauth (Go): affected all versions; fixed in 1.0.1-0.20260720133915-80bc87188ec3\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-2026-77560/ (Markdown: https://insights.sbomify.com/CVE-2026-77560/index.md)","id":"CVE-2026-77560","markdown":"https://insights.sbomify.com/CVE-2026-77560/index.md","name":"CVE-2026-77560","record":{"aliases":["GHSA-328g-jx67-v94g","GO-2026-6552"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Tinyauth authentication server","requires_auth":"low_privilege","summary":"An authenticated user can bypass per-app access controls by using a differently cased hostname, gaining unauthorized access to restricted applications.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"},{"id":"CWE-636","name":"Not Failing Securely"},{"id":"CWE-178","name":"Improper Handling of Case Sensitivity"}],"description":"Tinyauth is an authentication and authorization server. Prior to 5.1.2, Tinyauth compares forwarded hostnames case-sensitively while reverse proxies route equivalent hostnames case-insensitively, allowing an authenticated low-privilege user to bypass per-app access controls with a differently cased hostname. The lookup in internal/service/access_controls_service.go through lookupStaticACLs and GetAccessControls, and the Docker-label fallback in internal/service/docker_service.go through GetLabels, can miss the configured app and return an empty access-control object. internal/controller/proxy_controller.go proxyHandler then treats the empty user, group, OAuth, LDAP, and IP restrictions as permissive and returns an authenticated result for an app that should exclude the user. Unauthenticated users remain subject to login, and global login-time allowlists are not bypassed. This issue is fixed in version 5.1.2.","ecosystems":["Go"],"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":"Tinyauth: forward-auth per-app ACL is matched case-sensitively against the (case-insensitive) hostname, letting an authenticated user reach apps they are not on the allowlist for","id":"CVE-2026-77560","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":3,"n_references":6,"next":{"headline":"Tinyauth: Unauthenticated login attempts can trigger global login lockdown denial of service","id":"CVE-2026-77561"},"packages":[{"ecosystem":"Go","fixed":["1.0.1-0.20260720133915-80bc87188ec3"],"introduced":["0"],"last_affected":[],"package":"github.com/tinyauthapp/tinyauth","purl":null,"source":"GHSA-328g-jx67-v94g"},{"ecosystem":"Go","fixed":["1.0.1-0.20260720133915-80bc87188ec3"],"introduced":["0"],"last_affected":[],"package":"github.com/tinyauthapp/tinyauth","purl":"pkg:golang/github.com/tinyauthapp/tinyauth","source":"GHSA-328g-jx67-v94g"},{"ecosystem":"Go","fixed":["1.0.1-0.20260720133915-80bc87188ec3"],"introduced":["0"],"last_affected":[],"package":"github.com/tinyauthapp/tinyauth","purl":"pkg:golang/github.com/tinyauthapp/tinyauth","source":"GO-2026-6552"}],"prev":{"headline":"Denial of service in Cloud Gateways","id":"CVE-2026-77558"},"products":["tinyauth"],"published":"2026-09-21","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":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-21","vendors":["tinyauthapp"]},"summary":"An authenticated user can bypass per-app access controls by using a differently cased hostname, gaining unauthorized access to restricted applications.","url":"https://insights.sbomify.com/CVE-2026-77560/"}