CVE-2026-24307
published 2026-01-22CVE-2026-24307: Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
PriorityP347high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
0.81%
52.3th percentile
Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft_365_copilot | — | — |
| msrc | microsoft_365_copilot | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vendor_msrc9.3CRITICAL
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GHSA
GHSA-5wf5-mwm8-68x4: Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network
ghsa_unreviewed·2026-01-23
CVE-2026-24307 [CRITICAL] CWE-1287 GHSA-5wf5-mwm8-68x4: Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network
Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Microsoft
M365 Copilot Information Disclosure Vulnerability
vendor_msrc·2026-01-13·CVSS 9.3
CVE-2026-24307 [CRITICAL] CWE-1287 M365 Copilot Information Disclosure Vulnerability
M365 Copilot Information Disclosure Vulnerability
Description: Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
FAQ: Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability?
This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency.
Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.
M365 Copilot: M365 Copilot
Microsoft: Microsoft
Customer Action Required: No
Impact: Information Disclosure
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:N/A
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-01-22
Published