{"id":"CVE-2026-123552","kind":"vulnerability","aliases":["CVE-2026-123552"],"related":[],"title":"OpenAM: certificate revocation checks let attackers reach internal hosts","description":"OpenAM before 16.1.4 contains a server-side request forgery vulnerability in certificate CRL checking that fetches CRLs from the distribution point named in a presented certificate without restricting the destination or verifying the downloaded CRL's signature. Attackers holding a trusted-CA-chained certificate can make OpenAM request internal hosts, capture configured CRL update credentials, overwrite stored revocation data to block certificate authentication for that CA, and tie up authentication threads.","summary":"OpenAM fetches certificate revocation lists from addresses named inside a presented certificate without restricting the destination or verifying the list's signature. An attacker holding a certificate from a trusted certificate authority can make the server request internal hosts, read stored CRL credentials, overwrite revocation data, and tie up authentication threads.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["certificate-auth","openam","other","self-hosted"],"not_affected_if":["no-certificate-auth","version-16.1.4-or-later"],"how_to_check":"- Check the installed OpenAM version; `16.1.4` or later is not affected by the description given.\n- Look for certificate-based authentication with CRL checking enabled in the OpenAM configuration.","fix":"- OpenAM before `16.1.4`: move to `16.1.4` or later.","status":"open","published_at":"2026-11-08T02:16:46+00:00","first_seen_at":"2026-11-08T02:21:11+00:00","triaged_at":"2026-11-08T02:24:49+00:00","updated_at":"2026-11-08T02:24:49+00:00","category":"other","confidence":0.7,"triage":{"at":"2026-11-08T02:24:49Z","model":"claude-haiku-5-5","output":{"fix":"- OpenAM before `16.1.4`: move to `16.1.4` or later.","reach":"network","title":"OpenAM: certificate revocation checks let attackers reach internal hosts","impact":"medium","summary":"OpenAM fetches certificate revocation lists from addresses named inside a presented certificate without restricting the destination or verifying the list's signature. An attacker holding a certificate from a trusted certificate authority can make the server request internal hosts, read stored CRL credentials, overwrite revocation data, and tie up authentication threads.","audience":"businesses","category":"other","nicknames":[],"who_cares":["openam","self-hosted","certificate-auth"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"internal hosts reached and stored CRL credentials readable by attacker","analyst_note":"","how_to_check":"- Check the installed OpenAM version; `16.1.4` or later is not affected by the description given.\n- Look for certificate-based authentication with CRL checking enabled in the OpenAM configuration.","plain_action":"","needs_analyst":false,"not_affected_if":["version-16.1.4-or-later","no-certificate-auth"],"who_is_affected":"OpenAM deployments before 16.1.4 that use certificate-based authentication with CRL checking are exposed. An attacker must hold a certificate chained to a CA the deployment trusts. Deployments on 16.1.4 or later, or without certificate authentication, can skip it.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000709,"input_tokens":4329,"output_tokens":553,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-123552':12A,15A '-2026':11A,14A '16.1.4':77C 'address':30B 'attack':6A,47B,113C 'auth':18B 'authent':73B,139C,146C 'author':55B 'block':137C 'ca':118C,142C 'captur':127C 'certif':2A,17B,26B,35B,50B,54B,87C,101C,120C,138C 'certificate-auth':16B 'chain':119C 'check':4A,89C 'configur':128C 'contain':78C 'credenti':66B,131C 'crl':65B,88C,110C,129C 'crls':92C 'cve':10A,13A 'data':69B,135C 'destin':39B,105C 'distribut':95C 'download':109C 'fetch':25B,91C 'forgeri':84C 'hold':48B,114C 'host':9A,23B,62B,126C 'insid':32B 'intern':8A,61B,125C 'let':5A 'list':28B,43B 'make':57B,122C 'name':31B,97C 'openam':1A,19B,24B,75C,123C 'overwrit':67B,132C 'point':96C 'present':34B,100C 'reach':7A 'read':63B 'request':60B,83C,124C 'restrict':37B,103C 'revoc':3A,27B,68B,134C 'self':22B 'self-host':21B 'server':59B,81C 'server-sid':80C 'side':82C 'signatur':45B,112C 'store':64B,133C 'thread':74B,147C 'tie':71B,144C 'trust':53B,117C 'trusted-ca-chain':116C 'updat':130C 'verifi':41B,107C 'vulner':85C 'without':36B,102C","nicknames":[],"mitigations":[],"who_affected":"OpenAM deployments before 16.1.4 that use certificate-based authentication with CRL checking are exposed. An attacker must hold a certificate chained to a CA the deployment trusts. Deployments on 16.1.4 or later, or without certificate authentication, can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["certificateauth","medium","openam","other","selfhosted"],"campaign_type":null,"search_a":"'-123552':12A,15A '-2026':11A,14A 'attack':6A 'certif':2A 'check':4A 'cve':10A,13A 'host':9A 'intern':8A 'let':5A 'openam':1A 'reach':7A 'revoc':3A","search_b":"'address':30B 'attack':47B 'auth':18B 'authent':73B 'author':55B 'certif':17B,26B,35B,50B,54B 'certificate-auth':16B 'credenti':66B 'crl':65B 'data':69B 'destin':39B 'fetch':25B 'hold':48B 'host':23B,62B 'insid':32B 'intern':61B 'list':28B,43B 'make':57B 'name':31B 'openam':19B,24B 'overwrit':67B 'present':34B 'read':63B 'request':60B 'restrict':37B 'revoc':27B,68B 'self':22B 'self-host':21B 'server':59B 'signatur':45B 'store':64B 'thread':74B 'tie':71B 'trust':53B 'verifi':41B 'without':36B","search_c":"'16.1.4':77C 'attack':113C 'authent':139C,146C 'block':137C 'ca':118C,142C 'captur':127C 'certif':87C,101C,120C,138C 'chain':119C 'check':89C 'configur':128C 'contain':78C 'credenti':131C 'crl':88C,110C,129C 'crls':92C 'data':135C 'destin':105C 'distribut':95C 'download':109C 'fetch':91C 'forgeri':84C 'hold':114C 'host':126C 'intern':125C 'make':122C 'name':97C 'openam':75C,123C 'overwrit':132C 'point':96C 'present':100C 'request':83C,124C 'restrict':103C 'revoc':134C 'server':81C 'server-sid':80C 'side':82C 'signatur':112C 'store':133C 'thread':147C 'tie':144C 'trust':117C 'trusted-ca-chain':116C 'updat':130C 'verifi':107C 'vulner':85C 'without':102C","first_public_at":"2026-10-22T08:37:48+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/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-2026-123552","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123552","severity":null,"published_at":"2026-11-08T02:16:46+00:00","modified_at":"2026-11-08T02:16:46+00:00","first_seen_at":"2026-11-08T02:21:11+00:00","fetched_at":"2026-11-08T02:21:11+00:00","note":null}],"documents":[{"id":99253,"url":"https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-g5vw-v384-gw9v","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-22T08:37:48+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":99254,"url":"https://www.vulncheck.com/advisories/openam-before-16.1.4-ssrf-and-crl-tampering-via-certificate-crl-distribution-point","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"}