{"id":"CVE-2026-112237","kind":"vulnerability","aliases":["CVE-2026-112237"],"related":[],"title":"Browser extension proxy endpoint lets anyone make server fetch arbitrary URLs","description":"The extension provides a public proxy endpoint that fetches a URL on behalf of the visitor. For one HTTP request method, the endpoint does not apply the authorization check that protects the other methods, so the URL it fetches is fully controlled by the requester. An unauthenticated attacker can make the server send requests to arbitrary internal or external hosts. The attacker receives the status code and selected response headers, which allows probing of internal hosts and ports. Response bodies are not disclosed.","summary":"A public proxy endpoint in the extension fetches a URL supplied by the visitor, and one HTTP method skips the authorization check that protects the others. An unauthenticated attacker can make the server send requests to internal or external hosts and learn status codes and selected headers, which allows probing of internal hosts and ports.","severity":"medium","cvss":6.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["extension","other","self-hosted","ssrf"],"not_affected_if":["extension-not-installed"],"how_to_check":"- unknown","fix":"- unknown","status":"open","published_at":"2026-10-20T10:17:04+00:00","first_seen_at":"2026-10-23T21:57:20+00:00","triaged_at":"2026-10-25T03:40:32+00:00","updated_at":"2026-10-25T03:40:32+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-10-25T03:40:32Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"internet","title":"Browser extension proxy endpoint lets anyone make server fetch arbitrary URLs","impact":"medium","summary":"A public proxy endpoint in the extension fetches a URL supplied by the visitor, and one HTTP method skips the authorization check that protects the others. An unauthenticated attacker can make the server send requests to internal or external hosts and learn status codes and selected headers, which allows probing of internal hosts and ports.","category":"other","nicknames":[],"who_cares":["extension","self-hosted","ssrf"],"confidence":0.5,"needs_auth":"no","worst_case":"Attacker probes internal hosts and ports via server-side requests","analyst_note":"Identify the affected extension, its versions and the fixed release from the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-112237.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":["extension-not-installed"],"who_is_affected":"Anyone running the affected extension where its public proxy endpoint is reachable from the network. The sources do not name the product or the affected versions, so teams should first confirm whether they run this extension. Teams that do not run the extension can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.00057,"input_tokens":3365,"output_tokens":467,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-112237':14A,17A '-2026':13A,16A 'allow':72B,150C 'anyon':6A 'appli':104C 'arbitrari':10A,134C 'attack':52B,126C,140C 'author':44B,106C 'behalf':91C 'bodi':158C 'browser':1A 'check':45B,107C 'code':67B,144C 'control':120C 'cve':12A,15A 'disclos':161C 'endpoint':4A,27B,85C,101C 'extens':2A,18B,30B,80C 'extern':62B,137C 'fetch':9A,31B,87C,117C 'fulli':119C 'header':70B,148C 'host':22B,63B,76B,138C,154C 'http':40B,97C 'intern':60B,75B,135C,153C 'learn':65B 'let':5A 'make':7A,54B,128C 'method':41B,99C,112C 'one':39B,96C 'other':49B 'port':78B,156C 'probe':73B,151C 'protect':47B,109C 'provid':81C 'proxi':3A,26B,84C 'public':25B,83C 'receiv':141C 'request':58B,98C,123C,132C 'respons':147C,157C 'select':69B,146C 'self':21B 'self-host':20B 'send':57B,131C 'server':8A,56B,130C 'skip':42B 'ssrf':23B 'status':66B,143C 'suppli':34B 'unauthent':51B,125C 'url':11A,33B,89C,115C 'visitor':37B,94C","nicknames":[],"mitigations":[],"who_affected":"Anyone running the affected extension where its public proxy endpoint is reachable from the network. The sources do not name the product or the affected versions, so teams should first confirm whether they run this extension. Teams that do not run the extension can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T10:17:04+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/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":"f4fb688c-4412-4426-b4b8-421ecf27b14a","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-112237","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112237","severity":null,"published_at":"2026-10-20T10:17:04+00:00","modified_at":"2026-10-20T19:28:52+00:00","first_seen_at":"2026-10-23T21:57:20+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"}