{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-2839 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-2839 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-2839 is a medium-severity vulnerability in hwk-fr Advanced Custom Fields: Extended, published on 28 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-2839 and fix it if it is affected.\n\nWhat it is: CVE-2026-2839 is a medium-severity vulnerability in hwk-fr Advanced Custom Fields: Extended, published on 28 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-2839 in the wild and no public exploit code.\n\nAffected product: hwk-fr Advanced Custom Fields: Extended. 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-2026-2839/ (Markdown: https://insights.sbomify.com/CVE-2026-2839/index.md)","id":"CVE-2026-2839","markdown":"https://insights.sbomify.com/CVE-2026-2839/index.md","name":"CVE-2026-2839","record":{"aliases":["GHSA-6687-wfp7-4mp6"],"analysis":null,"analysis_generated_by":null,"assigner":"Wordfence","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-862","name":"Missing Authorization"}],"description":"The Advanced Custom Fields: Extended plugin for WordPress is vulnerable to unauthorized access of data and triggering of server-side actions in all versions up to, and including, 0.9.2.7. This is due to multiple AJAX handlers registered for unauthenticated users (`wp_ajax_nopriv_*`) that fail to implement proper `current_user_can()` authorization checks. While these handlers use ACF's `acf_verify_ajax()` function to validate cryptographic nonces, the `acf_nonce` values are generated for guest users and publicly exposed in the page source of any frontend page utilizing an ACF form. This makes it possible for unauthenticated attackers to extract the guest nonce and bypass WordPress visibility permissions, leading to the unauthorized disclosure of post titles and internal Flexible Content layout structures. The vulnerability was partially patched in version 0.9.2.4.","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":"The Advanced Custom Fields: Extended plugin for WordPress is vulnerable to unauthorized access of data and triggering of server-side actions","id":"CVE-2026-2839","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":7,"next":{"headline":"Cross-site scripting in Email Encoder – Protect Email Addresses and Phone Numbers","id":"CVE-2026-2840"},"packages":[],"prev":{"headline":"Cross-site scripting in Whole Enquiry Cart for WooCommerce","id":"CVE-2026-2838"},"products":["Advanced Custom Fields: Extended"],"published":"2026-10-28","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":"2026-10-29","vendors":["hwk-fr"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-2839/"}