{"id":"CVE-2026-121413","kind":"vulnerability","aliases":["CVE-2026-121413"],"related":[],"title":"Parse Server: session upgrade endpoint mints new sessions without permission check","description":"Parse Server before 8.6.112 and 9.0.0 before 9.10.6-alpha.4 contains an authorization bypass in the session upgrade endpoint, which creates a new session for any valid session token without enforcing the _Session class create class-level permission. Attackers holding a user's session token can send an already revocable token to /upgradeToRevocableSession to obtain additional sessions with fresh expiration that persist after the original session is logged out.","summary":"Parse Server's session upgrade endpoint creates new sessions for anyone holding a valid session token, ignoring the _Session create permission. An attacker with a stolen token can obtain sessions that survive the original user logging out.","severity":"low","cvss":3.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["node","package","parse-server","self-hosted"],"not_affected_if":["fixed-version","managed-hosting"],"how_to_check":"- Check the installed Parse Server version with `npm ls parse-server` and compare it to the fixed versions below.\n- Look for calls to `/upgradeToRevocableSession` in server or proxy logs.","fix":"- Parse Server before `8.6.112`: upgrade to `8.6.112` or later.\n- Parse Server `9.0.0` before `9.10.6-alpha.4`: upgrade to `9.10.6-alpha.4` or later.","status":"open","published_at":"2026-11-03T15:17:30+00:00","first_seen_at":"2026-11-03T15:21:58+00:00","triaged_at":"2026-11-03T15:24:50+00:00","updated_at":"2026-11-03T15:24:50+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-03T15:24:50Z","model":"claude-haiku-5-5","output":{"fix":"- Parse Server before `8.6.112`: upgrade to `8.6.112` or later.\n- Parse Server `9.0.0` before `9.10.6-alpha.4`: upgrade to `9.10.6-alpha.4` or later.","reach":"internet","title":"Parse Server: session upgrade endpoint mints new sessions without permission check","impact":"medium","summary":"Parse Server's session upgrade endpoint creates new sessions for anyone holding a valid session token, ignoring the _Session create permission. An attacker with a stolen token can obtain sessions that survive the original user logging out.","audience":"developers","category":"package","nicknames":[],"who_cares":["parse-server","node","self-hosted"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"attacker keeps persistent sessions after the victim logs out","analyst_note":"","how_to_check":"- Check the installed Parse Server version with `npm ls parse-server` and compare it to the fixed versions below.\n- Look for calls to `/upgradeToRevocableSession` in server or proxy logs.","plain_action":"","needs_analyst":false,"not_affected_if":["fixed-version","managed-hosting"],"who_is_affected":"Apps running a Parse Server version below the fixed releases that expose the upgradeToRevocableSession endpoint. The attacker needs a valid session token already, so exposure depends on how widely tokens leak. Teams on managed hosting or on releases at or above the fixed versions can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000705,"input_tokens":4223,"output_tokens":565,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-121413':14A,17A '-2026':13A,16A '/upgradetorevocablesession':114C '8.6.112':65C '9.0.0':67C '9.10.6':69C 'addit':117C 'alpha.4':70C 'alreadi':110C 'anyon':36B 'attack':48B,100C 'author':73C 'bypass':74C 'check':11A 'class':94C,97C 'class-level':96C 'contain':71C 'creat':32B,45B,81C,95C 'cve':12A,15A 'endpoint':5A,31B,79C 'enforc':91C 'expir':121C 'fresh':120C 'hold':37B,101C 'host':25B 'ignor':42B 'level':98C 'log':61B,129C 'mint':6A 'new':7A,33B,83C 'node':18B 'obtain':54B,116C 'origin':59B,126C 'packag':19B 'pars':1A,21B,26B,62C 'parse-serv':20B 'permiss':10A,46B,99C 'persist':123C 'revoc':111C 'self':24B 'self-host':23B 'send':108C 'server':2A,22B,27B,63C 'session':3A,8A,29B,34B,40B,44B,55B,77C,84C,88C,93C,105C,118C,127C 'stolen':51B 'surviv':57B 'token':41B,52B,89C,106C,112C 'upgrad':4A,30B,78C 'user':60B,103C 'valid':39B,87C 'without':9A,90C","nicknames":[],"mitigations":[],"who_affected":"Apps running a Parse Server version below the fixed releases that expose the upgradeToRevocableSession endpoint. The attacker needs a valid session token already, so exposure depends on how widely tokens leak. Teams on managed hosting or on releases at or above the fixed versions can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["low","node","package","parseserver","selfhosted"],"first_public_at":"2026-10-20T00:36:20+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/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-2026-121413","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121413","severity":null,"published_at":"2026-11-03T15:17:30+00:00","modified_at":"2026-11-03T15:17:30+00:00","first_seen_at":"2026-11-03T15:21:58+00:00","fetched_at":"2026-11-03T15:21:58+00:00","note":null}],"documents":[{"id":58349,"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-2j2x-c587-q33g","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-20T00:36:20+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":58350,"url":"https://www.vulncheck.com/advisories/parse-server-before-8.6.112-and-9.0.0-before-9.10.6-alpha.4-session-permission-bypass-via-upgradetorevocablesession","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}