GCVE-110-NCSC-2026-234

Advisory PublishedCVSS 8.8/10

Vulnetix · Advisory published July 14, 2026

An incorrect authorization vulnerability in Microsoft Exchange Online enables an authorized attacker to elevate privileges over a network, potentially compromising system integrity.

Download JSON Open in Console

Weaknesses (CWE)

CWE-863Incorrect AuthorizationCWE-122Heap-based Buffer OverflowCWE-1220Insufficient Granularity of Access ControlCWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CWE-502Deserialization of Untrusted Data

Risk Scores

CVSS 3.1

8.8/10

High · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions	Platforms
Microsoft	vers:unknown/*	—	—

Aliases

CVE-2026-54998 CVE-2026-55005 CVE-2026-55006 CVE-2026-55008 CVE-2026-55009

References

advisory

Browse GCVE Records

75,828 records in the GCVE database · Updated August 4, 2026

No matching records found.

Explore Further

Investigate this vulnerability in the interactive console or download the raw GCVE record.

Open in Console Download JSON