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High 8.8Published Jul 2, 2026
CVE-2026-54998Microsoft Exchange Online Elevation of Privilege Vulnerability
Updated under an hour ago ()
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It affects Microsoft Exchange Online. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Weakness (CWE)
- CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Microsoft Exchange Online microsoft:exchange_online (from the name) | - | CNA record |
microsoft exchange_online microsoft:exchange_online | all versions | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54998vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.