CVE tracker / CVE-2026-69375

CVE-2026-69375

CVE-2026-69375 is the Microsoft Exchange Server Tampering Vulnerability. Microsoft rates it Important, CVSS 6.5. It is not in CISA's Known Exploited Vulnerabilities catalog. Published September 8, 2026.

Risk summary

MediumTampering
6.5
CVSS v3 base
0.6%
EPSS: chance of exploitation in 30 days
Medium
Severity
Important
Microsoft's rating
Less Likely
Microsoft: exploitation
No
In CISA KEV

Microsoft describes it: “Authorization bypass through user-controlled key in Microsoft Exchange Server allows an authorized attacker to perform tampering over a network.”

How to fix it

Microsoft lists 4 affected products and the update that fixes each:

What Microsoft changed

Details

Weakness
CWE-639: Authorization Bypass Through User-Controlled Key
Publicly disclosed (Microsoft)
No
Exploited (Microsoft)
No
Known exploited (CISA KEV)
Not listed
Published
September 8, 2026
Last revised
September 8, 2026

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References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.