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The vulnerability of the Business Chat function in the Microsoft 365 Copilot intelligent virtual assistant allows a perpetrator to gain unauthorized access to protected information.
🗓️ 12 May 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec🔗 bdu.fstec.ru👁 1 Views
| Reporter | Title | Published | Views | Family All 13 |
|---|---|---|---|---|
 | CVE-2026-26129 | 7 May 202620:58 | – | attackerkb |
 | CVE-2026-26129 | 7 May 202623:09 | – | circl |
 | Microsoft 365 Copilot Business Chat 安全漏洞 | 7 May 202600:00 | – | cnnvd |
 | CVE-2026-26129 | 7 May 202620:58 | – | cve |
 | CVE-2026-26129 M365 Copilot Information Disclosure Vulnerability | 7 May 202620:58 | – | cvelist |
 | EUVD-2026-28445 | 8 May 202600:31 | – | euvd |
 | KLA91032 OSI vulnerabilities in Microsoft Apps | 7 May 202600:00 | – | kaspersky |
 | M365 Copilot Information Disclosure Vulnerability | 7 May 202614:00 | – | mscve |
 | CVE-2026-26129 | 7 May 202622:16 | – | nvd |
 | PT-2026-38574 | 7 May 202600:00 | – | ptsecurity |
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12 May 2026 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 37.5
CVSS 27.8
EPSS0.01135