{"id":"CVE-2026-126269","kind":"vulnerability","aliases":["CVE-2026-126269"],"related":[],"title":"NocoDB: stored XSS via attachment MIME types steals session tokens","description":"NocoDB before 2026.09.0 contains a stored cross-site scripting vulnerability that allows authenticated Editor users to execute scripts by storing crafted attachment MIME types like text/html;image/png. Attackers can write the value through the records API so the /dltemp signed URL serves HTML inline, stealing session tokens from localStorage to impersonate victims.","summary":"NocoDB before 2026.09.0 lets an authenticated Editor store a crafted attachment MIME type such as text/html;image/png, so the /dltemp signed URL serves HTML inline. Script running in that page can read session tokens from localStorage and impersonate other users.","severity":"critical","cvss":9.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["nocodb","other","self-hosted"],"not_affected_if":["no-editor-users","version-2026.09.0-or-later"],"how_to_check":"- Check the NocoDB version in use; it is affected below `2026.09.0`.","fix":"- Move to `2026.09.0` or later, per the NVD range.","status":"open","published_at":"2026-11-13T10:17:29+00:00","first_seen_at":"2026-11-13T10:47:12+00:00","triaged_at":"2026-11-13T10:48:24+00:00","updated_at":"2026-11-13T10:48:24+00:00","category":"other","confidence":0.7,"triage":{"at":"2026-11-13T10:48:24Z","model":"claude-haiku-5-5","output":{"fix":"- Move to `2026.09.0` or later, per the NVD range.","reach":"internet","title":"NocoDB: stored XSS via attachment MIME types steals session tokens","impact":"high","summary":"NocoDB before 2026.09.0 lets an authenticated Editor store a crafted attachment MIME type such as text/html;image/png, so the /dltemp signed URL serves HTML inline. Script running in that page can read session tokens from localStorage and impersonate other users.","audience":"businesses","category":"other","nicknames":[],"who_cares":["nocodb","self-hosted"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"Attacker runs script in victim session and takes over their account","analyst_note":"Check the vendor advisory on github.com and the VulnCheck advisory to confirm whether the fix is exactly 2026.09.0 and whether the attack needs a user to open the link.","how_to_check":"- Check the NocoDB version in use; it is affected below `2026.09.0`.\n- Unknown whether a specific config or setting changes exposure; the sources do not say.","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["version-2026.09.0-or-later","no-editor-users"],"who_is_affected":"Self-hosted or managed NocoDB instances before 2026.09.0 where users have the Editor role and can upload attachments. The attack needs an authenticated Editor account and the /dltemp signed URL being opened by another user, such as an admin, in a browser. Instances with only Viewer or admin accounts, or no attachment use, are less exposed.","user_interaction":"yes","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.00076,"input_tokens":4619,"output_tokens":597,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-126269':13A,16A '-2026':12A,15A '/dltemp':41B,101C '2026.09.0':24B,64C 'allow':74C 'api':98C 'attach':5A,32B,84C 'attack':90C 'authent':27B,75C 'contain':65C 'craft':31B,83C 'cross':69C 'cross-sit':68C 'cve':11A,14A 'editor':28B,76C 'execut':79C 'host':21B 'html':45B,105C 'image/png':38B,89C 'imperson':59B,113C 'inlin':46B,106C 'let':25B 'like':87C 'localstorag':57B,111C 'mime':6A,33B,85C 'nocodb':1A,17B,22B,62C 'page':51B 'read':53B 'record':97C 'run':48B 'script':47B,71C,80C 'self':20B 'self-host':19B 'serv':44B,104C 'session':9A,54B,108C 'sign':42B,102C 'site':70C 'steal':8A,107C 'store':2A,29B,67C,82C 'text/html':37B,88C 'token':10A,55B,109C 'type':7A,34B,86C 'url':43B,103C 'user':61B,77C 'valu':94C 'via':4A 'victim':114C 'vulner':72C 'write':92C 'xss':3A","nicknames":[],"mitigations":[],"who_affected":"Self-hosted or managed NocoDB instances before 2026.09.0 where users have the Editor role and can upload attachments. The attack needs an authenticated Editor account and the /dltemp signed URL being opened by another user, such as an admin, in a browser. Instances with only Viewer or admin accounts, or no attachment use, are less exposed.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["critical","nocodb","other","selfhosted"],"campaign_type":null,"search_a":"'-126269':13A,16A '-2026':12A,15A 'attach':5A 'cve':11A,14A 'mime':6A 'nocodb':1A 'session':9A 'steal':8A 'store':2A 'token':10A 'type':7A 'via':4A 'xss':3A","search_b":"'/dltemp':41B '2026.09.0':24B 'attach':32B 'authent':27B 'craft':31B 'editor':28B 'host':21B 'html':45B 'image/png':38B 'imperson':59B 'inlin':46B 'let':25B 'localstorag':57B 'mime':33B 'nocodb':17B,22B 'page':51B 'read':53B 'run':48B 'script':47B 'self':20B 'self-host':19B 'serv':44B 'session':54B 'sign':42B 'store':29B 'text/html':37B 'token':55B 'type':34B 'url':43B 'user':61B","search_c":"'/dltemp':101C '2026.09.0':64C 'allow':74C 'api':98C 'attach':84C 'attack':90C 'authent':75C 'contain':65C 'craft':83C 'cross':69C 'cross-sit':68C 'editor':76C 'execut':79C 'html':105C 'image/png':89C 'imperson':113C 'inlin':106C 'like':87C 'localstorag':111C 'mime':85C 'nocodb':62C 'record':97C 'script':71C,80C 'serv':104C 'session':108C 'sign':102C 'site':70C 'steal':107C 'store':67C,82C 'text/html':88C 'token':109C 'type':86C 'url':103C 'user':77C 'valu':94C 'victim':114C 'vulner':72C 'write':92C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-10-27T10:06:43+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/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-2026-126269","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126269","severity":null,"published_at":"2026-11-13T10:17:29+00:00","modified_at":"2026-11-13T10:17:29+00:00","first_seen_at":"2026-11-13T10:47:12+00:00","fetched_at":"2026-11-13T10:47:12+00:00","note":null}],"documents":[{"id":144867,"url":"https://github.com/nocodb/nocodb/security/advisories/GHSA-3f7w-wqf7-786q","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-27T10:06:43+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":144868,"url":"https://www.vulncheck.com/advisories/nocodb-before-2026.09.0-stored-xss-via-attachment-mime-type","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"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}