AI and data stack advisories

Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

MicrosoftCVE-2026-66303

Microsoft Skype for Business: null pointer dereference

Microsoft

CVE-2026-66303 · Published Sep 8, 2026 · updated Sep 16, 2026

Medium6.5
Fix: upgrade to 6.0.9319.885 or later (3 fixed versions below)
Microsoft advisory

Null pointer dereference in Skype for Business allows an authorized attacker to deny service over a network.

Affected versions

PackageAffectedFixed in
Skype for Business Server 2015 CU13
Product
>= 9319.0, < 6.0.9319.8856.0.9319.885
Skype for Business Server 2019 CU8
Product
>= 2046.0, < 7.0.2046.5697.0.2046.569
Skype for Business Server Subscription Edition CU1
Product
>= 2046.0, < 7.0.2046.8797.0.2046.879
Details and references
CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-476

More Microsoft advisories

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High 8.3Sep 8Microsoft Skype for Business: spoofingCVE-2026-69646fixed in 6.0.9319.885 +2Medium 6.5Sep 8Microsoft Skype for Business: cross-site scriptingCVE-2026-69642fixed in 6.0.9319.885 +2High 7.1Sep 8Microsoft Skype for Business: spoofingCVE-2026-66305fixed in 6.0.9319.885 +2Medium 6.5Sep 8Microsoft Skype for Business: information disclosureCVE-2026-66306fixed in 6.0.9319.885 +2High 7.5Sep 8Microsoft Skype for Business: integer overflowCVE-2026-66307fixed in 6.0.9319.885 +2Medium 6.5Sep 8Microsoft Skype for Business: out-of-bounds readCVE-2026-66308fixed in 6.0.9319.885 +2