VDB
CVE-2026-21520
CVE-2026-21520
PUBLISHED
CVSS 7.5 HIGH
Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector
EPSS 0.12% · 31.4th percentile
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C/CR:H/IR:L/AR:L
EPSS Score
0.12%
31.4th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| microsoft | copilot_studio | -, - |
| Microsoft | Microsoft Copilot Studio | *, - |
Exploit Intelligence
- CIRCL seen: CVE-2026-21520 (circl-sighting)
- CIRCL seen: CVE-2026-21520 (circl-sighting)
- CIRCL seen: CVE-2026-21520 (circl-sighting)
- https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1 (msrc)
- CIRCL seen: CVE-2026-21520 (circl-sighting)
- CIRCL seen: CVE-2026-21520 (circl-sighting)
- CIRCL seen: CVE-2026-21520 (circl-sighting)
- CIRCL seen: CVE-2026-21520 (circl-sighting)
- Copilot Studio Information Disclosure Vulnerability (circl)
- ATR-2026-00420-copilot-studio-sharepoint-indirect-injection.yaml (github-poc)
…and 9 more exploits
Timeline
- Jan 13, 2026 CVE Published
- Jan 22, 2026 CVE Updated
- Jan 23, 2026 EPSS Score
- Jan 23, 2026 PoC Published
- Jan 26, 2026 EPSS Score
- Jan 28, 2026 EPSS Score
- Jan 31, 2026 EPSS Score
- Feb 3, 2026 EPSS Score
- Feb 5, 2026 EPSS Score
- Feb 8, 2026 EPSS Score
- Feb 11, 2026 EPSS Score
- Feb 13, 2026 EPSS Score
References
- Copilot Studio Information Disclosure Vulnerability vendor-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-21520 advisory