What’s Vulnerable › Vulnerabilities
CVE-2026-54998: Microsoft Exchange Online Elevation of Privilege Vulnerability
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-02 · updated 2026-10-25
- Weakness: CWE-863
Description
Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.
Affected products
- Microsoft Exchange Online: all versions
- Microsoft Exchange Online: all versions
References
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