{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-67399 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-67399 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-67399 is a critical unsafe deserialization vulnerability in WebPros WHMCS, published on 14 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-2026-67399 and fix it if it is affected.\n\nWhat it is: CVE-2026-67399 is a critical unsafe deserialization vulnerability in WebPros WHMCS, published on 14 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-2026-67399 in the wild and no public exploit code.\n\nAffected product: WebPros WHMCS. 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-2026-67399/ (Markdown: https://insights.sbomify.com/CVE-2026-67399/index.md)","id":"CVE-2026-67399","markdown":"https://insights.sbomify.com/CVE-2026-67399/index.md","name":"CVE-2026-67399","record":{"aliases":["GHSA-5jq9-2qvc-rc4h"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"WHMCS billing software","requires_auth":"none","summary":"Remote attackers can execute arbitrary code via unsafe deserialization in WHMCS, requiring immediate upgrades to patched versions.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"hackerone","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-502","name":"Deserialization of Untrusted Data"}],"description":"Deserialization of untrusted data in WHMCS 9.0.0 before 9.0.8 and 8.0.0 before 8.13.7 allows remote attackers to execute arbitrary code.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Deserialization in WHMCS","id":"CVE-2026-67399","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"A missing token type check allowed to retrieve more additional information about the WOPI configuration with a user or guest token.","id":"CVE-2026-67400"},"packages":[],"prev":{"headline":"Missing authorization in WHMCS","id":"CVE-2026-67398"},"products":["WHMCS"],"published":"2026-09-14","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":"2026-09-15","vendors":["WebPros"]},"summary":"Remote attackers can execute arbitrary code via unsafe deserialization in WHMCS, requiring immediate upgrades to patched versions.","url":"https://insights.sbomify.com/CVE-2026-67399/"}