{"id":"CVE-2026-21521","aliases":["EUVD-2026-4498","GHSA-mmfw-g245-wgx2"],"status":"published","title":"Word Copilot Information Disclosure Vulnerability","description":"Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.","severity":{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00613,"percentile":0.49877,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-150"],"published":"2026-01-22T22:47:38Z","modified":"2026-07-30T20:47:33Z","products":[{"vendor":"microsoft","product":"365_word_copilot"},{"vendor":"microsoft","product":"microsoft 365 word copilot"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21521","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21521"},{"url":"https://github.com/advisories/GHSA-mmfw-g245-wgx2"}],"sources":{"cve":[{"id":"CVE-2026-21521","title":"Word Copilot Information Disclosure Vulnerability","description":"Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-01-22T22:47:38.118Z","modified":"2026-07-30T20:47:33.938Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-150"],"updated_at":"2026-11-02T13:41:42.05254Z"}],"euvd":[{"id":"EUVD-2026-4498","description":"Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-01-22T22:47:38Z","modified":"2026-07-30T20:47:33Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T18:02:26.773248Z"}],"ghsa":[{"id":"GHSA-mmfw-g245-wgx2","title":"Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized...","description":"Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-01-23T00:31:17Z","modified":"2026-01-23T00:31:24Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-150"],"updated_at":"2026-11-02T15:05:52.452073Z"}],"nvd":[{"id":"CVE-2026-21521","description":"Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-01-22T23:15:57.823Z","modified":"2026-06-17T10:18:46.57Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-150"],"updated_at":"2026-11-02T14:12:04.423757Z"}]}}