Is CVE-2026-24307 in the CISA KEV catalog?

No. CVE-2026-24307 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-24307?

CVE-2026-24307 has a CVSS v3 base score of 9.3 (Critical).

What is the EPSS score for CVE-2026-24307?

CVE-2026-24307 has an EPSS score of 0.81% (53th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-24307?

No published fix for CVE-2026-24307 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-24307

CRITICAL

9.3

CVSS v3

NVD

Description

Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.

CWE-1287Improper Validation of Specified Type of Input

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.81%probability of exploitation in 30 days

53rdpercentile

Moderate risk: more likely to be exploited than 53% of all known CVEs.

References

Vendor Advisory1

msrc.microsoft.com

Related Vulnerabilities

Other CWE-1287 (Improper Validation of Specified Type of Input) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-4879	Critical	9.8	100%	KEV	-
CVE-2022-31007	Medium	4.9	26%	-	Fix
CVE-2024-6298	Critical	10.0	19%	-	-
CVE-2026-25639	High	7.5	2.5%	-	Fix
CVE-2021-43802	Critical	9.9	2.0%	-	Fix
CVE-2024-51550	Critical	10.0	1.8%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-12.