{"id":"CVE-2026-120007","kind":"vulnerability","aliases":["CVE-2026-120007"],"related":[],"title":"NodeBB: registration flaw lets visitors clear other accounts' emails and sessions","description":"NodeBB 1.18.0 through 4.16.5 contains an authorization bypass vulnerability that allows unauthenticated visitors to act on other accounts by supplying a uid during POST /register. Attackers can submit an empty email at the /register/complete interstitial to clear a victim's email and confirmation state and revoke all their sessions.","summary":"NodeBB versions 1.18.0 through 4.16.5 let an unauthenticated visitor pass a victim's uid during registration and submit an empty email, which clears the victim's email and confirmation state. The same flaw revokes all of that victim's sessions.","severity":"medium","cvss":6.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["forum","nodebb","runtime","self-hosted"],"not_affected_if":["fixed-version","registration-closed"],"how_to_check":"- Check the installed NodeBB version in `package.json` or the admin dashboard; versions from 1.18.0 through 4.16.5 are in the affected range.\n- Confirm whether the forum allows open self-registration, since the flaw runs through the POST /register path.","fix":"- Move to a NodeBB release later than `4.16.5`; the sources do not name the exact fixed version.","status":"open","published_at":"2026-10-30T19:18:22+00:00","first_seen_at":"2026-10-30T19:25:29+00:00","triaged_at":"2026-10-30T19:26:15+00:00","updated_at":"2026-10-30T19:26:15+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-30T19:26:15Z","model":"claude-haiku-5-5","output":{"fix":"- Move to a NodeBB release later than `4.16.5`; the sources do not name the exact fixed version.","reach":"internet","title":"NodeBB: registration flaw lets visitors clear other accounts' emails and sessions","impact":"medium","summary":"NodeBB versions 1.18.0 through 4.16.5 let an unauthenticated visitor pass a victim's uid during registration and submit an empty email, which clears the victim's email and confirmation state. The same flaw revokes all of that victim's sessions.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["nodebb","self-hosted","forum"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker clears victim email and revokes all their sessions","analyst_note":"Confirm the fixed NodeBB version and whether registration must be enabled, using the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-120007.","how_to_check":"- Check the installed NodeBB version in `package.json` or the admin dashboard; versions from 1.18.0 through 4.16.5 are in the affected range.\n- Confirm whether the forum allows open self-registration, since the flaw runs through the POST /register path.","plain_action":"","needs_analyst":true,"not_affected_if":["fixed-version","registration-closed"],"who_is_affected":"Any NodeBB forum running a version from 1.18.0 through 4.16.5 that accepts registrations is exposed, because the flaw is reached through the public registration endpoint. Sites that run a newer release or have registration closed have a smaller exposure. The sources do not say whether a non-default setting is required.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000728,"input_tokens":4148,"output_tokens":626,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-120007':14A,17A '-2026':13A,16A '/register':88C '/register/complete':97C '1.18.0':26B,65C '4.16.5':28B,67C 'account':8A,81C 'act':78C 'allow':74C 'attack':89C 'author':70C 'bypass':71C 'clear':6A,46B,100C 'confirm':52B,106C 'contain':68C 'cve':12A,15A 'email':9A,44B,50B,94C,104C 'empti':43B,93C 'flaw':3A,56B 'forum':18B 'host':23B 'interstiti':98C 'let':4A,29B 'nodebb':1A,19B,24B,64C 'pass':33B 'post':87C 'registr':2A,39B 'revok':57B,109C 'runtim':20B 'self':22B 'self-host':21B 'session':11A,63B,112C 'state':53B,107C 'submit':41B,91C 'suppli':83C 'uid':37B,85C 'unauthent':31B,75C 'version':25B 'victim':35B,48B,61B,102C 'visitor':5A,32B,76C 'vulner':72C","nicknames":[],"mitigations":[],"who_affected":"Any NodeBB forum running a version from 1.18.0 through 4.16.5 that accepts registrations is exposed, because the flaw is reached through the public registration endpoint. Sites that run a newer release or have registration closed have a smaller exposure. The sources do not say whether a non-default setting is required.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"first_public_at":"2026-10-30T19:18:22+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-120007","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120007","severity":null,"published_at":"2026-10-30T19:18:22+00:00","modified_at":"2026-10-30T19:18:22+00:00","first_seen_at":"2026-10-30T19:25:29+00:00","fetched_at":"2026-10-30T19:25:29+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"}