CVE-2026-45503
published 2026-06-09CVE-2026-45503: Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
PriorityP339medium6.5CVSS 3.1
AVNACLPRLUINSUCHINAN
EPSS
0.45%
36.7th percentile
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server_subscription_edition | < 15.02.2562.043 | 15.02.2562.043 |
| microsoft | microsoft_exchange_server_2016_cumulative_update_23 | >= 15.01.0.0 < 15.01.2507.069 | 15.01.2507.069 |
| microsoft | microsoft_exchange_server_2019_cumulative_update_14 | >= 15.02.0.0 < 15.02.1544.041 | 15.02.1544.041 |
| microsoft | microsoft_exchange_server_2019_cumulative_update_15 | >= 15.02.0.0 < 15.02.1748.046 | 15.02.1748.046 |
| microsoft | microsoft_exchange_server_subscription_edition_rtm | >= 15.02.0.0 < 15.02.2562.043 | 15.02.2562.043 |
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VulDB
Microsoft Exchange Server prior 15.01.2507.069 improper authorization
vuldb·2026-06-09·CVSS 8.1
CVE-2026-45503 [HIGH] Microsoft Exchange Server prior 15.01.2507.069 improper authorization
A vulnerability marked as problematic has been reported in Microsoft Exchange Server. The impacted element is an unknown function. The manipulation leads to improper authorization.
This vulnerability is referenced as CVE-2026-45503. Remote exploitation of the attack is possible. No exploit is available.
It is suggested to upgrade the affected component.
GHSA
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
ghsa_unreviewed·2026-06-09
CVE-2026-45503 [HIGH] CWE-285 Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
No detection rules found.
No public exploits indexed.
Sans Isc
Microsoft June 2026 Patch Tuesday, (Tue, Jun 9th)
blogs_sans_isc·2026-06-09·CVSS 8.8
CVE-2026-49160 [HIGH] Microsoft June 2026 Patch Tuesday, (Tue, Jun 9th)
Microsoft June 2026 Patch Tuesday
Published: 2026-06-09. Last Updated: 2026-06-09 17:34:29 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
Microsoft today released patches for 204 vulnerabilities. 38 of these vulnerabilities are considered critical, and three have been disclosed before today. Six of the vulnerabilities affect Microsoft cloud solutions and do not require any user action. In addition, Microsoft incorporated 360 different vulnerabilities affecting Chromium into its Edge browser.
This is certainly a busier-than-usual patch Tuesday. In particular, the large number of patched Chromium/Edge vulnerabilities underscores the impact of AI tools on vulnerability discovery.
Some noteworthy vulnerabilities:
CVE-2026-49160: This vulnerability was made public a week ago. As implem
Rapid7
Patch Tuesday - June 2026
blogs_rapid7·2026-06-09·CVSS 7.8
CVE-2026-33825 [HIGH] Patch Tuesday - June 2026
Microsoft is publishing 200 vulnerabilities on June 2026 Patch Tuesday . Microsoft is not aware of exploitation in the wild for any of these vulnerabilities, and is aware of public disclosure for three. This is similar to last month’s Patch Tuesday, however several of last month’s vulnerabilities ended up on CISA KEV in the days following their publication. So far this month, Microsoft has provided patches to address 360 browser vulnerabilities, which is an order of magnitude more than has been typical in any given month over the past few years. As usual, browser vulns are not included in the Patch Tuesday count above. Indeed, the vast, and presumably sustained, uptick in the number of browser vulnerabilities has led to Microsoft no longer enumerating Chromium CVEs in the Security Update G
Bleepingcomputer
Microsoft June 2026 Patch Tuesday fixes 3 zero-day, 200 flaws
blogs_bleepingcomputer·2026-06-09·CVSS 7.8
CVE-2026-45586 [HIGH] Microsoft June 2026 Patch Tuesday fixes 3 zero-day, 200 flaws
## Microsoft June 2026 Patch Tuesday fixes 3 zero-day, 200 flaws
## Lawrence Abrams
65 Elevation of Privilege Vulnerabilities
19 Security Feature Bypass Vulnerabilities
55 Remote Code Execution Vulnerabilities
30 Information Disclosure Vulnerabilities
7 Denial of Service Vulnerabilities
27 Spoofing Vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today.
Therefore, the number of flaws does not include flaws in Mariner, Azure HorizonDB, Microsoft Copilot, Copilot Chat, M365 Copilot, Microsoft Exchange Online, and Microsoft Graph that were fixed by Microsoft earlier this month.
There were also a massive 360 Microsoft Edge/Chromium flaws that were fixed by Google this month, which were excluded from this Patch
2026-06-09
Published