{"id":"CVE-2026-118090","kind":"vulnerability","aliases":["CVE-2026-118090"],"related":[],"title":"MasterStudy LMS: subscribers can inject PHP objects through a flaw","description":"Subscriber PHP Object Injection in MasterStudy LMS <= 3.7.55 versions.","summary":"MasterStudy LMS versions up to and including 3.7.55 let a logged-in subscriber user submit data that is unsafely deserialized as a PHP object. An attacker with a subscriber account may be able to run code or change data on the site, with the exact impact depending on available gadget chains, which the sources do not describe.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["masterstudy-lms","package","php","wordpress"],"not_affected_if":["newer-version","plugin-not-installed"],"how_to_check":"- Check the installed MasterStudy LMS plugin version in the WordPress admin plugins page or the plugin header of `masterstudy-lms-learning-management-system`; `3.7.55` or older is affected.\n- Confirm whether subscriber-level accounts can register on the site.","fix":"- MasterStudy LMS: move to a version newer than `3.7.55`; the exact fixed version is unknown from the sources.","status":"open","published_at":"2026-10-30T19:18:17+00:00","first_seen_at":"2026-10-30T19:25:28+00:00","triaged_at":"2026-10-30T19:25:50+00:00","updated_at":"2026-10-30T19:25:50+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-30T19:25:50Z","model":"claude-haiku-5-5","output":{"fix":"- MasterStudy LMS: move to a version newer than `3.7.55`; the exact fixed version is unknown from the sources.","reach":"internet","title":"MasterStudy LMS: subscribers can inject PHP objects through a flaw","impact":"high","summary":"MasterStudy LMS versions up to and including 3.7.55 let a logged-in subscriber user submit data that is unsafely deserialized as a PHP object. An attacker with a subscriber account may be able to run code or change data on the site, with the exact impact depending on available gadget chains, which the sources do not describe.","audience":"businesses","category":"package","nicknames":[],"who_cares":["wordpress","masterstudy-lms","php"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"Attacker with subscriber account may run code on server","analyst_note":"Find the fixed MasterStudy LMS version and the vulnerable code path at https://nvd.nist.gov/vuln/detail/CVE-2026-118090 and the plugin changelog.","how_to_check":"- Check the installed MasterStudy LMS plugin version in the WordPress admin plugins page or the plugin header of `masterstudy-lms-learning-management-system`; `3.7.55` or older is affected.\n- Confirm whether subscriber-level accounts can register on the site.","plain_action":"","needs_analyst":true,"not_affected_if":["plugin-not-installed","newer-version"],"who_is_affected":"Sites running the MasterStudy LMS WordPress plugin at version 3.7.55 or older, especially where anyone can register as a subscriber. Sites on a newer release or without this plugin can skip it. The sources do not describe the exact code path or configuration required.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000726,"input_tokens":4056,"output_tokens":640,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-118090':13A,16A '-2026':12A,15A '3.7.55':30B,88C 'abl':56B 'account':53B 'attack':49B 'avail':72B 'chain':74B 'chang':61B 'code':59B 'cve':11A,14A 'data':39B,62B 'depend':70B 'describ':80B 'deseri':43B 'exact':68B 'flaw':10A 'gadget':73B 'impact':69B 'includ':29B 'inject':5A,84C 'let':31B 'lms':2A,19B,24B,87C 'log':34B 'logged-in':33B 'masterstudi':1A,18B,23B,86C 'masterstudy-lm':17B 'may':54B 'object':7A,47B,83C 'packag':20B 'php':6A,21B,46B,82C 'run':58B 'site':65B 'sourc':77B 'submit':38B 'subscrib':3A,36B,52B,81C 'unsaf':42B 'user':37B 'version':25B,89C 'wordpress':22B","nicknames":[],"mitigations":[],"who_affected":"Sites running the MasterStudy LMS WordPress plugin at version 3.7.55 or older, especially where anyone can register as a subscriber. Sites on a newer release or without this plugin can skip it. The sources do not describe the exact code path or configuration required.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"first_public_at":"2026-10-30T19:18:17+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"audit@patchstack.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-118090","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118090","severity":null,"published_at":"2026-10-30T19:18:17+00:00","modified_at":"2026-10-30T19:22:27+00:00","first_seen_at":"2026-10-30T19:25:28+00:00","fetched_at":"2026-10-30T19:25:28+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"}