{"id":"CVE-2026-123539","kind":"vulnerability","aliases":["CVE-2026-123539"],"related":[],"title":"OpenAM: stored XSS in display name steals session cookies","description":"OpenAM before 16.1.4 contains a stored cross-site scripting vulnerability that allows privileged attackers to inject script by placing markup in a user's display name. When the victim reaches the OAuth 2.0 / OpenID Connect consent page, the unencoded name executes script that can steal the OpenAM session cookie to impersonate the user.","summary":"OpenAM before 16.1.4 does not encode a user's display name on the OAuth 2.0 / OpenID Connect consent page. A privileged attacker who sets markup as a display name can run script in a victim's browser that steals the OpenAM session cookie and impersonates that user.","severity":"medium","cvss":4.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["oauth","openam","openid-connect","other","self-hosted"],"not_affected_if":["no-privileged-user-risk","openam-16.1.4-or-later"],"how_to_check":"- Check the OpenAM version in use; versions below `16.1.4` are in the affected range.\n- Review who holds privileged accounts that can edit user display names.","fix":"- OpenAM: move to `16.1.4` or later, per the sources.","status":"open","published_at":"2026-11-08T02:16:44+00:00","first_seen_at":"2026-11-08T02:21:10+00:00","triaged_at":"2026-11-08T02:25:30+00:00","updated_at":"2026-11-08T02:25:30+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-08T02:25:30Z","model":"claude-haiku-5-5","output":{"fix":"- OpenAM: move to `16.1.4` or later, per the sources.","reach":"internet","title":"OpenAM: stored XSS in display name steals session cookies","impact":"medium","summary":"OpenAM before 16.1.4 does not encode a user's display name on the OAuth 2.0 / OpenID Connect consent page. A privileged attacker who sets markup as a display name can run script in a victim's browser that steals the OpenAM session cookie and impersonates that user.","audience":"businesses","category":"other","nicknames":[],"who_cares":["openam","self-hosted","oauth","openid-connect"],"confidence":0.6,"fix_status":"available","needs_auth":"yes","worst_case":"session cookie stolen, user impersonated by script in browser","analyst_note":"","how_to_check":"- Check the OpenAM version in use; versions below `16.1.4` are in the affected range.\n- Review who holds privileged accounts that can edit user display names.","plain_action":"","needs_analyst":false,"not_affected_if":["openam-16.1.4-or-later","no-privileged-user-risk"],"who_is_affected":"Organizations running OpenAM before 16.1.4 that use the OAuth 2.0 / OpenID Connect consent page. The attacker must be a privileged user who can set display names, and the victim must open the consent page. unknown whether other configurations are affected.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000687,"input_tokens":4285,"output_tokens":516,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-123539':12A,15A '-2026':11A,14A '16.1.4':27B,74C '2.0':39B,105C 'allow':84C 'attack':46B,86C 'browser':61B 'connect':20B,41B,107C 'consent':42B,108C 'contain':75C 'cooki':9A,67B,121C 'cross':79C 'cross-sit':78C 'cve':10A,13A 'display':5A,34B,52B,97C 'encod':30B 'execut':113C 'host':24B 'imperson':69B,123C 'inject':88C 'markup':49B,92C 'name':6A,35B,53B,98C,112C 'oauth':16B,38B,104C 'openam':1A,17B,25B,65B,72C,119C 'openid':19B,40B,106C 'openid-connect':18B 'page':43B,109C 'place':91C 'privileg':45B,85C 'reach':102C 'run':55B 'script':56B,81C,89C,114C 'self':23B 'self-host':22B 'session':8A,66B,120C 'set':48B 'site':80C 'steal':7A,63B,117C 'store':2A,77C 'unencod':111C 'user':32B,71B,95C,125C 'victim':59B,101C 'vulner':82C 'xss':3A","nicknames":[],"mitigations":[],"who_affected":"Organizations running OpenAM before 16.1.4 that use the OAuth 2.0 / OpenID Connect consent page. The attacker must be a privileged user who can set display names, and the victim must open the consent page. unknown whether other configurations are affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["medium","oauth","openam","openidconnect","other","selfhosted"],"campaign_type":null,"search_a":"'-123539':12A,15A '-2026':11A,14A 'cooki':9A 'cve':10A,13A 'display':5A 'name':6A 'openam':1A 'session':8A 'steal':7A 'store':2A 'xss':3A","search_b":"'16.1.4':27B '2.0':39B 'attack':46B 'browser':61B 'connect':20B,41B 'consent':42B 'cooki':67B 'display':34B,52B 'encod':30B 'host':24B 'imperson':69B 'markup':49B 'name':35B,53B 'oauth':16B,38B 'openam':17B,25B,65B 'openid':19B,40B 'openid-connect':18B 'page':43B 'privileg':45B 'run':55B 'script':56B 'self':23B 'self-host':22B 'session':66B 'set':48B 'steal':63B 'user':32B,71B 'victim':59B","search_c":"'16.1.4':74C '2.0':105C 'allow':84C 'attack':86C 'connect':107C 'consent':108C 'contain':75C 'cooki':121C 'cross':79C 'cross-sit':78C 'display':97C 'execut':113C 'imperson':123C 'inject':88C 'markup':92C 'name':98C,112C 'oauth':104C 'openam':72C,119C 'openid':106C 'page':109C 'place':91C 'privileg':85C 'reach':102C 'script':81C,89C,114C 'session':120C 'site':80C 'steal':117C 'store':77C 'unencod':111C 'user':95C,125C 'victim':101C 'vulner':82C","first_public_at":"2026-10-22T09:36:13+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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-2026-123539","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123539","severity":null,"published_at":"2026-11-08T02:16:44+00:00","modified_at":"2026-11-08T02:16:44+00:00","first_seen_at":"2026-11-08T02:21:10+00:00","fetched_at":"2026-11-08T02:21:10+00:00","note":null}],"documents":[{"id":99227,"url":"https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-v6hq-3cfh-5gr6","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-22T09:36:13+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":99228,"url":"https://www.vulncheck.com/advisories/openam-before-16.1.4-stored-xss-via-oauth-2.0-consent-page-display-name","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"}],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}