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CVE-2023-29357

Microsoft SharePoint Server Privilege Escalation

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwareEPSS 100.0%
  1. Published13 Jun 2023
  2. Added to CISA KEV10 Jan 2024
  3. Remediation due31 Jan 2024
Actively exploited (CISA KEV)

Microsoft SharePoint Server contains an unspecified vulnerability that allows an unauthenticated attacker, who has gained access to spoofed JWT authentication tokens, to use them for executing a network attack. This attack bypasses authentication, enabling the attacker to gain administrator privileges.

Added to KEV: 10 Jan 2024Federal remediation due: 31 Jan 2024Used in ransomware

Description

Microsoft SharePoint Server Elevation of Privilege Vulnerability

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft SharePoint Server2019

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2023-29357 being actively exploited?

Yes. CVE-2023-29357 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 10 Jan 2024. It has been used in ransomware campaigns.

How severe is CVE-2023-29357?

CVE-2023-29357 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 100.0% probability of exploitation.

Which products are affected by CVE-2023-29357?

Affected products include Microsoft SharePoint Server.

How do I fix CVE-2023-29357?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-29357 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.