{"id":"CVE-2026-54857","kind":"vulnerability","aliases":["CVE-2026-54857"],"related":[],"title":"Quirky WordPress plugin: unauthenticated PHP object injection up to 1.23","description":"Unauthenticated PHP Object Injection in Quirky <= 1.23 versions.","summary":"Quirky versions 1.23 and older accept untrusted input that gets unserialized as a PHP object. An unauthenticated attacker can use this to inject objects, which can lead to code execution on the server.","severity":"critical","cvss":9.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","php","quirky","wordpress"],"not_affected_if":["plugin-not-installed"],"how_to_check":"- Check the installed Quirky plugin version in the WordPress admin plugin list, or in the plugin's main file header.","fix":"- Move Quirky past `1.23`; the sources do not name the fixed version.","status":"open","published_at":"2026-10-29T16:18:09+00:00","first_seen_at":"2026-10-29T16:25:59+00:00","triaged_at":"2026-10-29T16:27:40+00:00","updated_at":"2026-10-29T16:27:40+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-29T16:27:40Z","model":"claude-haiku-5-5","output":{"fix":"- Move Quirky past `1.23`; the sources do not name the fixed version.","reach":"internet","title":"Quirky WordPress plugin: unauthenticated PHP object injection up to 1.23","impact":"high","summary":"Quirky versions 1.23 and older accept untrusted input that gets unserialized as a PHP object. An unauthenticated attacker can use this to inject objects, which can lead to code execution on the server.","audience":"businesses","category":"package","nicknames":[],"who_cares":["wordpress","quirky","php"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker may run code on the server via object injection","analyst_note":"Confirm the fixed Quirky version and the vulnerable entry point from the NVD record or the plugin's changelog.","how_to_check":"- Check the installed Quirky plugin version in the WordPress admin plugin list, or in the plugin's main file header.\n- unknown for other checks: the sources do not say which request or setting is the entry point.","plain_action":"","needs_analyst":true,"not_affected_if":["plugin-not-installed"],"who_is_affected":"Sites running Quirky version 1.23 or older are exposed. The sources do not say which endpoint or setting is the entry point, so whether a site without a special configuration is reachable is unknown.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000656,"input_tokens":4047,"output_tokens":503,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-54857':13A,16A '1.23':10A,23B,60C 'accept':26B 'attack':38B 'code':49B 'cve':11A,14A 'execut':50B 'get':30B 'inject':7A,43B,57C 'input':28B 'lead':47B 'object':6A,35B,44B,56C 'older':25B 'packag':17B 'php':5A,18B,34B,55C 'plugin':3A 'quirki':1A,19B,21B,59C 'server':53B 'unauthent':4A,37B,54C 'unseri':31B 'untrust':27B 'use':40B 'version':22B,61C 'wordpress':2A,20B","nicknames":[],"mitigations":[],"who_affected":"Sites running Quirky version 1.23 or older are exposed. The sources do not say which endpoint or setting is the entry point, so whether a site without a special configuration is reachable is unknown.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"first_public_at":"2026-10-29T16:18:09+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"audit@patchstack.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-54857","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54857","severity":null,"published_at":"2026-10-29T16:18:09+00:00","modified_at":"2026-10-29T16:20:19+00:00","first_seen_at":"2026-10-29T16:25:59+00:00","fetched_at":"2026-10-29T16:25:59+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"}