CVE-2026-42824
CVE-2026-42824 is a medium-severity vulnerability in Microsoft Copilot with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.
Key facts
- Severity: Medium (CVSS 3.x base score 6.5)
- EPSS exploit prediction: 8% (94th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-34334
- Weakness: CWE-77
- Affected product: Microsoft Copilot
- Published:
- Last modified:
Description
Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Frequently asked questions
- What is CVE-2026-42824?
- Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
- How severe is CVE-2026-42824?
- CVE-2026-42824 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2026-42824 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-42824?
- CVE-2026-42824 affects Microsoft Copilot. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-42824?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-42824 have an EU (EUVD) identifier?
- Yes. CVE-2026-42824 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34334.
- When was CVE-2026-42824 published?
- CVE-2026-42824 was published on 2026-06-04 and last updated on 2026-06-19.
References
Affected products (1)
- cpe:2.3:a:microsoft:copilot:-:*:*:*:*:*:*:*
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