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Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

MicrosoftCVE-2026-69356

Microsoft Exchange Server: cross-site scripting

Microsoft

CVE-2026-69356 · Published Sep 8, 2026 · updated Sep 30, 2026

Critical9.3
Fix: upgrade to 15.01.2507.073 or later (4 fixed versions below)
Microsoft advisory

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Affected versions

PackageAffectedFixed in
Microsoft Exchange Server 2016 Cumulative Update 23
Product
>= 15.01.0.0, < 15.01.2507.07315.01.2507.073
Microsoft Exchange Server 2019 Cumulative Update 14
Product
>= 15.02.0.0, < 15.02.1544.04615.02.1544.046
Microsoft Exchange Server 2019 Cumulative Update 15
Product
>= 15.02.0.0, < 15.02.1748.05115.02.1748.051
Microsoft Exchange Server Subscription Edition RTM
Product
>= 15.02.0.0, < 15.02.2562.04915.02.2562.049
Details and references
CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-79

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