Authenticated information disclosure via server-side request forgery
Published Jun 9, 2026 · Updated Jun 9, 2026
Improper authorization in Microsoft Exchange Server allows remote authenticated users to disclose information through server-side requests. Microsoft has not published the affected component or the authorization error that lets attacker-controlled input drive the server-side request. Authenticated network access is required, and public sources do not identify the data or systems reachable through the forged request.
Summary
What happened
Improper authorization in Microsoft Exchange Server allows remote authenticated users to disclose information through server-side requests. Microsoft has not published the affected component or the authorization error that lets attacker-controlled input drive the server-side request. Authenticated network access is required, and public sources do not identify the data or systems reachable through the forged request.
The record
- CVE
- CVE-2026-45503
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Microsoft Exchange Server 2019 Cumulative Update 14
- Classifications
- CWE-285, CWE-918, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=15.02.0.0 <15.02.1544.041
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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