{"id":"CVE-2026-126814","kind":"vulnerability","aliases":["CVE-2026-126814"],"related":[],"title":"blueprintUE Self-Hosted: iframe injection lets logged-in users frame phishing pages","description":"blueprintUE Self-Hosted Edition before 4.3.6 contains an iframe injection vulnerability that allows authenticated users to embed arbitrary third-party content by abusing the PeerTube video URL matcher in BlueprintService::findVideoProvider(). Attackers can set a blueprint video URL on an attacker-controlled host, which site.js loads in an unsandboxed iframe after consent, framing fake login forms or malware downloads.","summary":"blueprintUE Self-Hosted Edition before 4.3.6 lets an authenticated user embed arbitrary third-party content through a flawed PeerTube video URL matcher in BlueprintService::findVideoProvider(). An attacker can host a blueprint video URL on their own server, and site.js loads it in an unsandboxed iframe after consent, so fake login forms or malware downloads can appear inside the site.","severity":"medium","cvss":4.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"blueprintUE Self-Hosted Edition","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["blueprintue","iframe","other","self-hosted"],"not_affected_if":["no-authenticated-user-access","version-4.3.6-or-later"],"how_to_check":"- Check the installed blueprintUE Self-Hosted Edition version and confirm it is at or above `4.3.6`.","fix":"- blueprintUE Self-Hosted Edition: upgrade to `4.3.6`.","status":"open","published_at":"2026-11-11T21:16:46+00:00","first_seen_at":"2026-11-11T21:29:09+00:00","triaged_at":"2026-11-11T21:31:02+00:00","updated_at":"2026-11-11T21:31:02+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-11T21:31:02Z","model":"claude-haiku-5-5","output":{"fix":"- blueprintUE Self-Hosted Edition: upgrade to `4.3.6`.","reach":"internet","title":"blueprintUE Self-Hosted: iframe injection lets logged-in users frame phishing pages","impact":"medium","summary":"blueprintUE Self-Hosted Edition before 4.3.6 lets an authenticated user embed arbitrary third-party content through a flawed PeerTube video URL matcher in BlueprintService::findVideoProvider(). An attacker can host a blueprint video URL on their own server, and site.js loads it in an unsandboxed iframe after consent, so fake login forms or malware downloads can appear inside the site.","audience":"businesses","category":"other","nicknames":[],"who_cares":["blueprintue","self-hosted","iframe"],"confidence":0.6,"fix_status":"available","needs_auth":"yes","worst_case":"Phishing forms and malware download links shown inside the trusted site","analyst_note":"","how_to_check":"- Check the installed blueprintUE Self-Hosted Edition version and confirm it is at or above `4.3.6`.\n- Unknown whether the sources give a configuration check.","plain_action":"","product_name":"blueprintUE Self-Hosted Edition","needs_analyst":false,"not_affected_if":["version-4.3.6-or-later","no-authenticated-user-access"],"who_is_affected":"Teams that run blueprintUE Self-Hosted Edition before 4.3.6 are exposed, and the exposure needs an authenticated account that can set a blueprint video URL. Teams on 4.3.6 or later, or who do not run the self-hosted edition, can skip it.","user_interaction":"yes","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.001136,"input_tokens":4677,"output_tokens":1337,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-126814':17A,20A '-2026':16A,19A '4.3.6':38B,99C 'abus':117C 'allow':106C 'appear':89B 'arbitrari':44B,111C 'attack':60B,126C,136C 'attacker-control':135C 'authent':41B,107C 'blueprint':64B,130C 'blueprintservic':57B,124C 'blueprintu':1A,26B,32B,93C 'blueprintue':21A 'consent':80B,147C 'contain':100C 'content':48B,115C 'control':137C 'cve':15A,18A 'download':87B,154C 'edit':36B,97C 'edition':25A 'emb':43B,110C 'fake':82B,149C 'findvideoprovid':58B,125C 'flaw':51B 'form':84B,151C 'frame':12A,148C 'host':4A,31B,35B,62B,96C,138C 'hosted':24A 'ifram':5A,27B,78B,102C,145C 'inject':6A,103C 'insid':90B 'let':7A,39B 'load':73B,141C 'log':9A 'logged-in':8A 'login':83B,150C 'malwar':86B,153C 'matcher':55B,122C 'page':14A 'parti':47B,114C 'peertub':52B,119C 'phish':13A 'self':3A,23A,30B,34B,95C 'self-host':2A,29B,33B,94C 'self-hosted':22A 'server':70B 'set':128C 'site':92B 'site.js':72B,140C 'third':46B,113C 'third-parti':45B,112C 'unsandbox':77B,144C 'url':54B,66B,121C,132C 'user':11A,42B,108C 'video':53B,65B,120C,131C 'vulner':104C","nicknames":[],"mitigations":[],"who_affected":"Teams that run blueprintUE Self-Hosted Edition before 4.3.6 are exposed, and the exposure needs an authenticated account that can set a blueprint video URL. Teams on 4.3.6 or later, or who do not run the self-hosted edition, can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":["blueprintueselfhostededition","selfhostededition"],"ptokens":["blueprintue","edition","hosted","self"],"labels":["blueprintue","iframe","medium","other","selfhosted","vendor"],"campaign_type":null,"search_a":"'-126814':17A,20A '-2026':16A,19A 'blueprintu':1A 'blueprintue':21A 'cve':15A,18A 'edition':25A 'frame':12A 'host':4A 'hosted':24A 'ifram':5A 'inject':6A 'let':7A 'log':9A 'logged-in':8A 'page':14A 'phish':13A 'self':3A,23A 'self-host':2A 'self-hosted':22A 'user':11A","search_b":"'4.3.6':38B 'appear':89B 'arbitrari':44B 'attack':60B 'authent':41B 'blueprint':64B 'blueprintservic':57B 'blueprintu':26B,32B 'consent':80B 'content':48B 'download':87B 'edit':36B 'emb':43B 'fake':82B 'findvideoprovid':58B 'flaw':51B 'form':84B 'host':31B,35B,62B 'ifram':27B,78B 'insid':90B 'let':39B 'load':73B 'login':83B 'malwar':86B 'matcher':55B 'parti':47B 'peertub':52B 'self':30B,34B 'self-host':29B,33B 'server':70B 'site':92B 'site.js':72B 'third':46B 'third-parti':45B 'unsandbox':77B 'url':54B,66B 'user':42B 'video':53B,65B","search_c":"'4.3.6':99C 'abus':117C 'allow':106C 'arbitrari':111C 'attack':126C,136C 'attacker-control':135C 'authent':107C 'blueprint':130C 'blueprintservic':124C 'blueprintu':93C 'consent':147C 'contain':100C 'content':115C 'control':137C 'download':154C 'edit':97C 'emb':110C 'fake':149C 'findvideoprovid':125C 'form':151C 'frame':148C 'host':96C,138C 'ifram':102C,145C 'inject':103C 'load':141C 'login':150C 'malwar':153C 'matcher':122C 'parti':114C 'peertub':119C 'self':95C 'self-host':94C 'set':128C 'site.js':140C 'third':113C 'third-parti':112C 'unsandbox':144C 'url':121C,132C 'user':108C 'video':120C,131C 'vulner':104C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-11T16:34:07+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/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-2026-126814","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126814","severity":null,"published_at":"2026-11-11T21:16:46+00:00","modified_at":"2026-11-11T21:16:46+00:00","first_seen_at":"2026-11-11T21:29:09+00:00","fetched_at":"2026-11-11T21:29:09+00:00","note":null}],"documents":[{"id":129002,"url":"https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/5f13e2bb8cd4c620899e9f8afd41a6e62b3bc6a4","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":129003,"url":"https://github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.6","title":"Release notes: github.com","kind":"release","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Release notes: github.com"},{"id":129004,"url":"https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-3vgc-fcfg-v233","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-11-11T16:34:07+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":129005,"url":"https://www.vulncheck.com/advisories/blueprintue-self-hosted-edition-before-4.3.6-arbitrary-iframe-embedding-via-peertube-matcher","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"}