CVE-2026-24307
M365 Copilot Information Disclosure Vulnerability
Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
M365 Copilot Information Disclosure Vulnerability
Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
- Record
CVE-2026-24307- CVSS 3.1
- 9.3 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C - Weakness
- CWE-1287
- Updated
- 2026-11-02
EUVDEUVD-2026-4497
Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
- Record
EUVD-2026-4497- CVSS 3.1
- 9.3 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-5wf5-mwm8-68x4
Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to...
Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
- Record
GHSA-5wf5-mwm8-68x4- CVSS 3.1
- 9.3 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N - Weakness
- CWE-1287
- Updated
- 2026-11-02
NVD
Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
- Record
CVE-2026-24307- CVSS 3.1
- 9.3 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-1287
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-24307 is a critical vulnerability (CVSS 9.3) in Microsoft 365 Copilot, published January 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.91%, the 60th percentile. No source names a fixed version.