{"id":"CVE-2026-94267","kind":"vulnerability","aliases":["CVE-2026-94267"],"related":[],"title":"WordPress ACF Extended plugins: unauthenticated post overwrite leads to code execution","description":"The Advanced Custom Fields: Extended WordPress plugin before 0.9.2.8, Advanced Custom Fields: Extended PRO WordPress plugin before 0.9.2.8 does not perform any capability check when updating a post through one of its front-end form actions, allowing unauthenticated visitors to overwrite arbitrary posts, including the ones in which the site stores its own field definitions, which in turn leads to arbitrary code execution on the server. Exploitation requires the site to publish a form whose post-update action maps both its target and its content to visitor-submitted values.","summary":"The Advanced Custom Fields: Extended and Extended PRO WordPress plugins before 0.9.2.8 skip capability checks on front-end form post updates. An anonymous visitor can overwrite any post, including the site's field definitions, which can lead to code execution on the server.","severity":"critical","cvss":9.0,"epss":0.00302,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["advanced-custom-fields-extended","advanced-custom-fields-extended-pro","package","wordpress"],"not_affected_if":["no-public-post-update-forms","plugin-not-installed"],"how_to_check":"Check the installed plugin version for advanced-custom-fields-extended or advanced-custom-fields-extended-pro; anything below 0.9.2.8 is affected. Review front-end forms that map post target and content to submitted values.","fix":"Update both plugins to 0.9.2.8 or later.\nIf an update is not possible, remove or disable front-end forms whose post-update action takes its target and content from visitor input.","status":"open","published_at":"2026-10-23T06:17:08+00:00","first_seen_at":"2026-10-23T21:57:32+00:00","triaged_at":"2026-10-23T22:31:35+00:00","updated_at":"2026-10-25T12:38:51+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-23T22:31:35Z","model":"claude-haiku-5-5","output":{"fix":"Update both plugins to 0.9.2.8 or later.\nIf an update is not possible, remove or disable front-end forms whose post-update action takes its target and content from visitor input.","reach":"internet","title":"WordPress ACF Extended plugins: unauthenticated post overwrite leads to code execution","impact":"high","summary":"The Advanced Custom Fields: Extended and Extended PRO WordPress plugins before 0.9.2.8 skip capability checks on front-end form post updates. An anonymous visitor can overwrite any post, including the site's field definitions, which can lead to code execution on the server.","category":"package","who_cares":["wordpress","advanced-custom-fields-extended","advanced-custom-fields-extended-pro"],"confidence":0.7,"needs_auth":"no","worst_case":"Anonymous visitors overwrite posts and field definitions, leading to code execution on the server","analyst_note":"Confirm the exact fixed version and the exploit prerequisites at https://nvd.nist.gov/vuln/detail/CVE-2026-94267 and the plugin changelog, since the sources give only the NVD record.","how_to_check":"Check the installed plugin version for advanced-custom-fields-extended or advanced-custom-fields-extended-pro; anything below 0.9.2.8 is affected. Review front-end forms that map post target and content to submitted values.","needs_analyst":true,"not_affected_if":["plugin-not-installed","no-public-post-update-forms"],"user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"critical"},"cost_usd":0.000579,"input_tokens":3051,"output_tokens":548,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-94267':14A,17A '0.9.2.8':42B,83C,92C 'acf':2A 'action':111C,154C 'advanc':19B,24B,32B,76C,84C 'advanced-custom-fields-extend':18B 'advanced-custom-fields-extended-pro':23B 'allow':112C 'anonym':54B 'arbitrari':117C,136C 'capabl':44B,97C 'check':45B,98C 'code':10A,70B,137C 'content':161C 'custom':20B,25B,33B,77C,85C 'cve':12A,15A 'definit':65B,130C 'end':49B,109C 'execut':11A,71B,138C 'exploit':142C 'extend':3A,22B,27B,35B,37B,79C,87C 'field':21B,26B,34B,64B,78C,86C,129C 'form':50B,110C,149C 'front':48B,108C 'front-end':47B,107C 'includ':60B,119C 'lead':8A,68B,134C 'map':155C 'one':104C,121C 'overwrit':7A,57B,116C 'packag':29B 'perform':95C 'plugin':4A,40B,81C,90C 'post':6A,51B,59B,102C,118C,152C 'post-upd':151C 'pro':28B,38B,88C 'publish':147C 'requir':143C 'server':74B,141C 'site':62B,125C,145C 'skip':43B 'store':126C 'submit':165C 'target':158C 'turn':133C 'unauthent':5A,113C 'updat':52B,100C,153C 'valu':166C 'visitor':55B,114C,164C 'visitor-submit':163C 'whose':150C 'wordpress':1A,30B,39B,80C,89C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-23T06:17:08+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","cvss_by":"134c704f-9b21-4f2e-91b3-4a467353bcc0","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-94267","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-94267","severity":null,"published_at":"2026-10-23T06:17:08+00:00","modified_at":"2026-10-23T14:20:57+00:00","first_seen_at":"2026-10-23T21:57:32+00:00","fetched_at":"2026-10-23T22:29:03+00:00","note":null},{"source":"epss","external_id":"CVE-2026-94267","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-94267","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T07:15:51+00:00","fetched_at":"2026-10-25T12:38:51+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}