CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

CVE-2023-29357: Microsoft SharePoint Server Privilege Escalation Vulnerability

criticalknown exploitedpublic exploitCVE-2023-29357
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Microsoftproduct: SharePoint ServerPrivilege escalation
What
An unauthenticated attacker can use spoofed JWT authentication tokens to gain administrator privileges.
Who is affected
Deployments of Microsoft SharePoint Server that are vulnerable to this attack.
Urgency
Remediation is urgent due to the critical nature of the vulnerability and confirmed exploitation.
Action
Apply the latest security patch provided by Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch SharePoint Server

Get an email when a new SharePoint Server advisory drops — max one per day, one-click unsubscribe.

Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2024-01-10
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-29357

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2023-29357coverage & exploitation statusNVD · CVE.org

More from CISA Known Exploited Vulnerabilities