CVE-2026-54130
Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
CSIRTS triage
- What
- Missing authentication for a critical function allows unauthorized information disclosure.
- Who is affected
- Users of M365 Copilot may be affected.
- Urgency
- Remediation is critical urgency due to the critical severity rating.
- Action
- Apply the relevant patches immediately.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-54130
Get an email if CVE-2026-54130 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.58% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 44% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalCVE-2026-54130: M365 Copilot Information Disclosure Vulnerabilitymsrc · 2026-06-09
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-54130)