{"id":"CVE-2026-96187","kind":"vulnerability","aliases":["CVE-2026-96187"],"related":[],"title":"Microsoft Edge: type confusion lets a remote attacker read information","description":"Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.","summary":"A type confusion flaw in Microsoft Edge (Chromium-based) lets an unauthorized attacker access resources with an incompatible type. The result is information disclosure over the network.","severity":"high","cvss":7.4,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft Edge (Chromium-based)","fixed":["155.0.4283.45"],"affected":"< 155.0.4283.45","ecosystem":"vendor"}],"ecosystems":[],"tags":["browser","chromium","edge","other","windows"],"not_affected_if":["patched-build"],"how_to_check":"Open edge://settings/help (Settings > About Microsoft Edge) and compare the version to 155.0.4283.45; anything lower on the 155 line, or any version before 155, is vulnerable. Enterprises: check the installed msedge.exe version across fleet.","fix":"Update Microsoft Edge (Chromium-based) to 155.0.4283.45 or later (current Stable 156.0.4314.42 per release notes of Oct 22, 2026).","status":"open","published_at":"2026-10-29T16:20:08+00:00","first_seen_at":"2026-10-29T16:26:03+00:00","triaged_at":"2026-10-29T16:29:42+00:00","updated_at":"2026-10-29T16:34:55+00:00","category":"other","confidence":0.8,"triage":{"at":"2026-10-29T16:29:42Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Edge: type confusion lets a remote attacker read information","impact":"low","summary":"A type confusion flaw in Microsoft Edge (Chromium-based) lets an unauthorized attacker access resources with an incompatible type. The result is information disclosure over the network.","audience":"everyone","category":"other","nicknames":[],"who_cares":["edge","windows","chromium"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"attacker reads information from the browser over the network","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-96187 for affected versions, fixed build, and whether user interaction is required.","how_to_check":"- Open Edge and check the version under Settings > About Microsoft Edge.\n- unknown","plain_action":"Update Microsoft Edge to the latest version through Settings > About Microsoft Edge.","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000611,"input_tokens":4081,"output_tokens":405,"severity_before":"high"},"analyst_status":"done","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-96187 for affected versions, fixed build, and whether user interaction is required.","search":"'-2026':12A,15A '-96187':13A,16A 'access':41B,55C 'allow':69C 'attack':8A,40B,72C 'base':36B,68C 'based':21A 'browser':22B 'chromium':20A,23B,35B,67C 'chromium-bas':34B,66C 'chromium-based':19A 'confus':4A,29B,62C 'cve':11A,14A 'disclos':74C 'disclosur':51B 'edg':2A,24B,33B,65C 'edge':18A 'flaw':30B 'incompat':45B,59C 'inform':10A,50B,75C 'let':5A,37B 'microsoft':1A,17A,32B,64C 'network':54B,78C 'read':9A 'remot':7A 'resourc':42B,57C 'result':48B 'type':3A,28B,46B,60C,61C 'unauthor':39B,71C 'use':58C 'window':26B","nicknames":[],"mitigations":[],"who_affected":"Anyone running Microsoft Edge (Chromium-based) older than build 155.0.4283.45. An attacker needs a user to click a crafted link and visit a malicious page, which could then read parts of browser process memory and might escape the browser sandbox. Machines with Edge auto-updated to the current build can skip it.","tier":"B","verified":{"fix":{"at":"2026-10-29T16:34:55Z","by":"analyst","doc":"https://learn.microsoft.com/en-us/deployedge/microsoft-edge-relnotes-security","run_id":1064},"products":{"at":"2026-10-29T16:34:55Z","by":"analyst","doc":"https://learn.microsoft.com/en-us/deployedge/microsoft-edge-relnotes-security","run_id":1064},"how_to_check":{"at":"2026-10-29T16:34:55Z","by":"analyst","doc":"https://learn.microsoft.com/en-us/deployedge/microsoft-edge-relnotes-security","run_id":1064},"who_affected":{"at":"2026-10-29T16:34:55Z","by":"analyst","doc":"https://learn.microsoft.com/en-us/deployedge/microsoft-edge-relnotes-security","run_id":1064}},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Microsoft Edge: Settings > About Microsoft Edge, then restart the browser.","first_public_at":"2026-10-29T16:20:08+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-96187","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96187","severity":null,"published_at":"2026-10-29T16:20:08+00:00","modified_at":"2026-10-29T16:20:08+00:00","first_seen_at":"2026-10-29T16:26:03+00:00","fetched_at":"2026-10-29T16:26:03+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-96187:1064","url":null,"severity":null,"published_at":"2026-10-29T16:34:55+00:00","modified_at":"2026-10-29T16:34:55+00:00","first_seen_at":"2026-10-29T16:34:55+00:00","fetched_at":"2026-10-29T16:34:55+00:00","note":"Read MSRC advisory: fixed build 155.0.4283.45 (Edge Stable), not exploited, not publicly disclosed, UI required, memory read with possible sandbox escape. No fix_status none; fix exists. Release-note page shows later builds (155.0.4283.62, 156.0.4314.42) too; its Oct 27 entry says Microsoft is working on a further Chromium fix, so newest build is safest. No X/discussion searched (routine B)."}],"documents":[{"id":17783,"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96187","title":"MSRC: CVE-2026-96187 Edge (Chromium-based) Information Disclosure","kind":"advisory","source":"analyst","publisher":null,"text":null,"published_at":null,"relation":"advisory","confidence":null,"note":null},{"id":17760,"url":"https://learn.microsoft.com/en-us/deployedge/microsoft-edge-relnotes-security","title":"Microsoft Edge security release notes","kind":"release","source":"analyst","publisher":null,"text":null,"published_at":null,"relation":"fix","confidence":null,"note":null}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}