{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-109371 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-109371 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-109371 is a high-severity missing authorization vulnerability in zitadel, published on 12 Oct 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-2026-109371 and fix it if it is affected.\n\nWhat it is: CVE-2026-109371 is a high-severity missing authorization vulnerability in zitadel, published on 12 Oct 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-2026-109371 in the wild and no public exploit code.\n\nAffected product: zitadel. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-109371/ (Markdown: https://insights.sbomify.com/CVE-2026-109371/index.md)","id":"CVE-2026-109371","markdown":"https://insights.sbomify.com/CVE-2026-109371/index.md","name":"CVE-2026-109371","record":{"aliases":["GHSA-2464-29qv-3mj7","GHSA-4hgj-wm6c-q7p2"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["privilege_escalation","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Identity and Access Management","requires_auth":"none","summary":"Unauthenticated attackers can change usernames of any user, including admins, via the Login V1 UI, causing lockouts and potential privilege escalation.","user_interaction":"not_required","vuln_class":"missing_authorization"},"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:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"}],"description":"ZITADEL 3.0.0 before 4.18.0 contains a missing authentication vulnerability in the hosted Login V1 UI, where the change-username handler acts on the account bound to a login flow before any factor is verified. Unauthenticated attackers can submit a victim's login name and then post a new username to rename any active human user, including administrators, locking them out.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"ZITADEL 3.0.0 before 4.18.0 Unauthenticated Username Change via Login V1","id":"CVE-2026-109371","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"ZITADEL 3.0.0 before 4.19.2 Account Takeover via SAML Identity-Provider Confusion","id":"CVE-2026-109372"},"packages":[],"prev":{"headline":"The Document Embedder – let visitors read files without downloading plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Script","id":"CVE-2026-109370"},"products":["zitadel"],"published":"2026-10-12","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-15","vendors":["zitadel"]},"summary":"Unauthenticated attackers can change usernames of any user, including admins, via the Login V1 UI, causing lockouts and potential privilege escalation.","url":"https://insights.sbomify.com/CVE-2026-109371/"}