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Vulnerability record · CVE-2026-54998 · published 2 July 2026

CVE-2026-54998: Microsoft exchange online incorrect authorization vulnerability

Microsoft · Exchange Online

Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.

8.8 CVSS 3.1 High EPSS 0.78% · top 45.9% CWE-863 · Incorrect authorization
8.8CVSS 3.1 base score
0.78%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
7 Jul 2026Last modified by NVD

Description

Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54998 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2026-65801Microsoft exchange online server-side request forgery (ssrf) vulnerabilityServer-side request forgery (ssrf) in Microsoft Exchange Online allows an unauthorized attacker to elevate privileges over a network.EPSS 0.90%10.0CVE-2026-56191Microsoft exchange online improper authentication vulnerabilityImproper authentication in Microsoft Exchange Online allows an unauthorized attacker to perform tampering over a network.EPSS 0.90%9.6CVE-2026-48582Microsoft exchange online missing authorization vulnerabilityMissing authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.EPSS 0.69%7.5CVE-2026-48579Microsoft exchange online improper authorization vulnerabilityImproper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.EPSS 1.00%9.1CVE-2026-71362Adobe commerce incorrect authorization vulnerabilityAdobe Commerce is affected by an Incorrect Authorization vulnerability that could result in privilege escalation. An attacker could leverage this vul…KEVEPSS 88%8.8CVE-2026-42016JFrog Artifactory token scope bypass enables privilege escalationJFrog Artifactory (Self Hosted) before 7.133.11 validates a token's signature and issuer but not its scope, so a token can be used for actions beyond…KEVEPSS 8.6%analysed10.0CVE-2025-54253Adobe Experience Manager Forms misconfiguration allows pre-auth code executionAdobe Experience Manager Forms 6.5.23 and earlier contain a misconfiguration (CWE-863, incorrect authorization) that lets an attacker bypass security…KEVEPSS 88%analysed5.4CVE-2025-55177WhatsApp iOS and Mac linked-device sync authorization flawWhatsApp for iOS, WhatsApp Business for iOS and WhatsApp for Mac fail to fully authorize linked-device synchronization messages, letting an unrelated…KEVEPSS 4.3%analysed

Source: NIST National Vulnerability Database (record CVE-2026-54998), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.