{"id":"CVE-2026-38671","kind":"vulnerability","aliases":["CVE-2026-38671"],"related":[],"title":"Ellucian Banner Student Registration: XSS via mepCode parameter lets attackers run scripts","description":"Cross Site Scripting vulnerability in Ellucian Banner Student Registration Self-Service (StudentRegistrationSsb) 9.23 and prior (no fixed version available) allows a remote attacker to execute arbitrary code via the mepCode parameter of the /ssb/registration endpoint","summary":"Ellucian Banner Student Registration Self-Service (StudentRegistrationSsb) 9.23 and earlier fails to sanitize the mepCode parameter on the /ssb/registration endpoint, enabling cross-site scripting. A remote attacker can get a victim's browser to run script in the context of the Banner session, which can expose student data or actions taken as that user.","severity":"medium","cvss":6.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ellucian-banner","higher-education","student-registration","vendor","web-app"],"not_affected_if":["module-not-deployed"],"how_to_check":"- Check the installed Banner Student Registration Self-Service version against `9.23` and earlier, using the vendor's admin or release documentation\n- Test whether the `/ssb/registration` endpoint reflects the `mepCode` parameter unescaped, for example with a harmless marker in a request to a non-production instance","fix":"- No fixed version is listed in the sources (unknown); contact Ellucian support for a patch or mitigation\n- Until a fix exists, restrict or filter the `mepCode` parameter at a web application firewall or reverse proxy","status":"open","published_at":"2026-10-19T13:16:58+00:00","first_seen_at":"2026-10-23T21:57:18+00:00","triaged_at":"2026-10-25T04:04:17+00:00","updated_at":"2026-10-25T04:04:17+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T04:04:17Z","model":"claude-haiku-5-5","output":{"fix":"- No fixed version is listed in the sources (unknown); contact Ellucian support for a patch or mitigation\n- Until a fix exists, restrict or filter the `mepCode` parameter at a web application firewall or reverse proxy","reach":"internet","title":"Ellucian Banner Student Registration: XSS via mepCode parameter lets attackers run scripts","impact":"medium","summary":"Ellucian Banner Student Registration Self-Service (StudentRegistrationSsb) 9.23 and earlier fails to sanitize the mepCode parameter on the /ssb/registration endpoint, enabling cross-site scripting. A remote attacker can get a victim's browser to run script in the context of the Banner session, which can expose student data or actions taken as that user.","category":"vendor","nicknames":[],"who_cares":["ellucian-banner","higher-education","student-registration","web-app"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker script runs in a student's browser session on the registration site","analyst_note":"Confirm the fixed version or vendor mitigation with Ellucian and check the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-38671 for the affected version range.","how_to_check":"- Check the installed Banner Student Registration Self-Service version against `9.23` and earlier, using the vendor's admin or release documentation\n- Test whether the `/ssb/registration` endpoint reflects the `mepCode` parameter unescaped, for example with a harmless marker in a request to a non-production instance","needs_analyst":true,"not_affected_if":["module-not-deployed"],"who_is_affected":"Institutions running Ellucian Banner Student Registration Self-Service at version 9.23 or earlier are exposed, since the flaw is on the public registration endpoint. Sites that do not run this module, or run a newer release the sources do not list as affected, can skip it.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000682,"input_tokens":3328,"output_tokens":698,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-38671':15A,18A '/ssb/registration':51B,122C '9.23':40B,101C 'action':83B 'allow':108C 'app':31B 'arbitrari':114C 'attack':10A,60B,111C 'avail':107C 'banner':2A,21B,33B,75B,94C 'browser':66B 'code':115C 'context':72B 'cross':55B,88C 'cross-sit':54B 'cve':13A,16A 'data':81B 'earlier':42B 'educ':24B 'ellucian':1A,20B,32B,93C 'ellucian-bann':19B 'enabl':53B 'endpoint':52B,123C 'execut':113C 'expos':79B 'fail':43B 'fix':105C 'get':62B 'higher':23B 'higher-educ':22B 'let':9A 'mepcod':7A,47B,118C 'paramet':8A,48B,119C 'prior':103C 'registr':4A,27B,35B,96C 'remot':59B,110C 'run':11A,68B 'sanit':45B 'script':12A,57B,69B,90C 'self':37B,98C 'self-servic':36B,97C 'servic':38B,99C 'session':76B 'site':56B,89C 'student':3A,26B,34B,80B,95C 'student-registr':25B 'studentregistrationssb':39B,100C 'taken':84B 'user':87B 'vendor':28B 'version':106C 'via':6A,116C 'victim':64B 'vulner':91C 'web':30B 'web-app':29B 'xss':5A","nicknames":[],"mitigations":[],"who_affected":"Institutions running Ellucian Banner Student Registration Self-Service at version 9.23 or earlier are exposed, since the flaw is on the public registration endpoint. Sites that do not run this module, or run a newer release the sources do not list as affected, can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-19T13:16:58+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cvss_by":"134c704f-9b21-4f2e-91b3-4a467353bcc0","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-38671","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-38671","severity":null,"published_at":"2026-10-19T13:16:58+00:00","modified_at":"2026-10-19T21:13:39+00:00","first_seen_at":"2026-10-23T21:57:18+00:00","fetched_at":"2026-10-23T22:28:57+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}