{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-33543 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-33543 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-33543 is a critical authentication bypass vulnerability in FOSSBilling, published on 24 Jun 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-2026-33543 and fix it if it is affected.\n\nWhat it is: CVE-2026-33543 is a critical authentication bypass vulnerability in FOSSBilling, published on 24 Jun 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-2026-33543 in the wild and no public exploit code.\n\nAffected product: FOSSBilling. 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-2026-33543/ (Markdown: https://insights.sbomify.com/CVE-2026-33543/index.md)","id":"CVE-2026-33543","markdown":"https://insights.sbomify.com/CVE-2026-33543/index.md","name":"CVE-2026-33543","record":{"aliases":["GHSA-28mh-j262-q49w"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["privilege_escalation","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Billing management system","requires_auth":"none","summary":"An authentication bypass in FOSSBilling allows attackers to create administrator accounts via a guest API endpoint, gaining full administrative privileges.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":9.3,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"},{"id":"CWE-288","name":"Authentication Bypass Using an Alternate Path or Channel"}],"description":"FOSSBilling is a free, open-source billing and client management system. Versions 0.7.2 and prior expose a guest API endpoint, /api/guest/staff/create, intended for initial administrator bootstrap. Due to a flawed admin-existence check, the endpoint remains usable after an administrator already exists. The flawed guard check uses is_countable() on a value that returns a Model_Admin object or null rather than a countable type, causing the expression to always evaluate as true and bypass the intended protection. As a result, an attacker can reach the unprotected endpoint to create a new administrator account and immediately authenticate, gaining a fully privileged admin session even when an admin already exists. This issue has been fixed in version 0.8.0.","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":"FOSSBilling: Authentication bypass allows unauthenticated administrator creation","id":"CVE-2026-33543","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Tinyauth has OAuth account confusion via shared mutable state on singleton service instances","id":"CVE-2026-33544"},"packages":[],"prev":{"headline":"Incus does not verify combined fingerprint when downloading images from simplestreams servers","id":"CVE-2026-33542"},"products":["FOSSBilling"],"published":"2026-06-24","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":"total"},"state":"PUBLISHED","updated":"2026-06-25","vendors":["FOSSBilling"]},"summary":"An authentication bypass in FOSSBilling allows attackers to create administrator accounts via a guest API endpoint, gaining full administrative privileges.","url":"https://insights.sbomify.com/CVE-2026-33543/"}