Quick answers
- Is CVE-2026-42824 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-42824 being exploited in the wild.
- How severe is CVE-2026-42824?
- Medium severity, with a CVSS score of 6.5, published 4 June 2026.
- Which products and versions are affected?
- Microsoft M365 Copilot.
- Is there a fix for CVE-2026-42824?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-42824 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-42824?
- Check whether you run Microsoft M365 Copilot. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A command injection vulnerability (CWE-77) exists in Microsoft 365 Copilot due to improper neutralization of special elements used in commands. The vulnerability is reachable over the network and requires no elevated privileges, though it does require some level of user interaction (UI:R). An attacker can exploit this flaw to bypass security boundaries and disclose information to an unauthorized destination. Microsoft has classified this as a medium-severity issue with a high impact on confidentiality but no impact on integrity or availability.
Affected products
- Microsoft M365 Copilot
Timeline
- 2026-06-04: disclosed
- 2026-06-04: advisory: Original MSRC advisory published