{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18391 exists.","fix":"No fix has been published for CVE-2026-18391 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-18391 is a critical unsafe deserialization vulnerability in Unknown WooCommerce Subscriptions, published on 12 Aug 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-2026-18391 and fix it if it is affected.\n\nWhat it is: CVE-2026-18391 is a critical unsafe deserialization vulnerability in Unknown WooCommerce Subscriptions, published on 12 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18391 exists.\n\nAffected product: Unknown WooCommerce Subscriptions. 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-2026-18391/ (Markdown: https://insights.sbomify.com/CVE-2026-18391/index.md)","id":"CVE-2026-18391","markdown":"https://insights.sbomify.com/CVE-2026-18391/index.md","name":"CVE-2026-18391","record":{"aliases":["GHSA-5736-34m2-3cxc"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"WooCommerce Subscriptions plugin","requires_auth":"none","summary":"Unauthenticated attackers can achieve remote code execution via PHP object injection in WooCommerce Subscriptions when High-Performance Order Storage is enabled.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"WPScan","cpe":[],"cvss":{"score":9.8,"severity":"critical","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-434","name":"Unrestricted Upload of File with Dangerous Type"}],"description":"The WooCommerce Subscriptions WordPress plugin before 9.1.0 does not validate user input before unserializing it on stores with High-Performance Order Storage enabled, leading to a PHP Object Injection issue which unauthenticated users can escalate to Remote Code Execution via a gadget chain present in the bundled dependencies.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"WooCommerce Subscriptions \u003c 9.1.0 - Unauthenticated RCE via PHP Object Injection","id":"CVE-2026-18391","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"** REJECT ** DO NOT USE THIS CANDIDATE NUMBER.","id":"CVE-2026-18392"},"packages":[],"prev":{"headline":"Command Injection in Ministry of Justice's UYAP Document Editor","id":"CVE-2026-18390"},"products":["WooCommerce Subscriptions"],"published":"2026-08-12","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":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-12","vendors":["Unknown"]},"summary":"Unauthenticated attackers can achieve remote code execution via PHP object injection in WooCommerce Subscriptions when High-Performance Order Storage is enabled.","url":"https://insights.sbomify.com/CVE-2026-18391/"}