MicrosoftCVE-2026-54998
Microsoft Exchange Online: improper authorization
High8.8CVE-2026-54998 · Published Jul 2, 2026 · updated Jul 7, 2026
Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Microsoft Exchange Online Product | all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-863
More Microsoft advisories
All Microsoft| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Jul 3 | Microsoft Edge (Chromium-based): integer overflow | High8.8 | 150.0.4078.48 |
| Jul 2 | Microsoft Azure Open AI: server-side request forgery | Critical9.9 | No fix yet |
| Jul 2 | Microsoft Entra Provisioning Service: server-side request forgery | Critical9.9 | No fix yet |
| Jul 2 | Microsoft 365 Copilot: open redirect | Critical9.3 | No fix yet |
| Jul 2 | Microsoft Azure Synapse: improper access control | Medium4.8 | No fix yet |
| Jul 1 | Microsoft Edge (Chromium-based): use after free | High8.3 | 149.0.4022.68 |