{"answers":{"affected":"3 open source packages ship an affected version, including github.com/steveiliop56/tinyauth. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33544 exists.","fix":"Upgrade github.com/steveiliop56/tinyauth to 1.0.1-0.20260401140714-fc1d4f2082a5 or later.","what":"CVE-2026-33544 is a high-severity vulnerability in steveiliop56 tinyauth, published on 2 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-33544 and fix it if it is affected.\n\nWhat it is: CVE-2026-33544 is a high-severity vulnerability in steveiliop56 tinyauth, published on 2 Apr 2026. Any signed-in user can exploit it over the network, 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-2026-33544 exists.\n\nAffected packages and fixed versions:\n- github.com/steveiliop56/tinyauth (Go): affected all versions; fixed in 1.0.1-0.20260401140714-fc1d4f2082a5\n- github.com/steveiliop56/tinyauth (Go): affected all versions; fixed in 1.0.1-0.20260401140714-fc1d4f2082a5\n- github.com/steveiliop56/tinyauth (Go): affected all versions; fixed in 1.0.1-0.20260401140714-fc1d4f2082a5\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-2026-33544/ (Markdown: https://insights.sbomify.com/CVE-2026-33544/index.md)","id":"CVE-2026-33544","markdown":"https://insights.sbomify.com/CVE-2026-33544/index.md","name":"CVE-2026-33544","record":{"aliases":["GHSA-9q5m-jfc4-wc92","GO-2026-5296"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"OAuth authentication server","requires_auth":"low_privilege","summary":"Concurrent OAuth logins can cause identity confusion, allowing one user to gain access to another user's account due to shared mutable state.","user_interaction":"required","vuln_class":"race_condition"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"tinyauth","vendor":"tinyauth"}],"cvss":{"score":7.7,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-362","name":"Concurrent Execution using Shared Resource with Improper Synchronization"}],"description":"Tinyauth is an authentication and authorization server. Prior to version 5.0.5, all three OAuth service implementations (GenericOAuthService, GithubOAuthService, GoogleOAuthService) store PKCE verifiers and access tokens as mutable struct fields on singleton instances shared across all concurrent requests. When two users initiate OAuth login for the same provider concurrently, a race condition between VerifyCode() and Userinfo() causes one user to receive a session with the other user's identity. This issue has been patched in version 5.0.5.","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":"Tinyauth has OAuth account confusion via shared mutable state on singleton service instances","id":"CVE-2026-33544","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"race_condition","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"MobSF has SQL Injection in its SQLite Database Viewer Utils","id":"CVE-2026-33545"},"packages":[{"ecosystem":"Go","fixed":["1.0.1-0.20260401140714-fc1d4f2082a5"],"introduced":["0"],"last_affected":[],"package":"github.com/steveiliop56/tinyauth","purl":null,"source":"GHSA-9q5m-jfc4-wc92"},{"ecosystem":"Go","fixed":["1.0.1-0.20260401140714-fc1d4f2082a5"],"introduced":["0"],"last_affected":[],"package":"github.com/steveiliop56/tinyauth","purl":"pkg:golang/github.com/steveiliop56/tinyauth","source":"GHSA-9q5m-jfc4-wc92"},{"ecosystem":"Go","fixed":["1.0.1-0.20260401140714-fc1d4f2082a5"],"introduced":["0"],"last_affected":[],"package":"github.com/steveiliop56/tinyauth","purl":"pkg:golang/github.com/steveiliop56/tinyauth","source":"GO-2026-5296"}],"prev":{"headline":"FOSSBilling: Authentication bypass allows unauthenticated administrator creation","id":"CVE-2026-33543"},"products":["tinyauth"],"published":"2026-04-02","related":[{"cvss_score":8.5,"headline":"Tinyauth vulnerable to TOTP/2FA bypass via OIDC authorize endpoint","id":"CVE-2026-32246","kev_date_added":null,"published":"2026-03-12"},{"cvss_score":6.5,"headline":"Tinyauth's OIDC authorization codes are not bound to client on token exchange","id":"CVE-2026-32245","kev_date_added":null,"published":"2026-03-12"}],"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":"US public information, NVD API terms","name":"NVD"},{"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":"2026-04-03","vendors":["steveiliop56"]},"summary":"Concurrent OAuth logins can cause identity confusion, allowing one user to gain access to another user's account due to shared mutable state.","url":"https://insights.sbomify.com/CVE-2026-33544/"}