CVE-2023-29357
Microsoft SharePoint Server Elevation of Privilege Vulnerability
Critical
Known exploited
- Severity
- 9.8 / 10
- Critical · CVSS 3.1
- Exploit chance (EPSS)
- 99.98%
- Chance of exploitation in the next 30 days. Higher than 99.98% of scored vulnerabilities.
- Known exploited
- Yes
- In CISA's catalog since Jan 10, 2024
- Weakness
- CWE-303 Incorrect Implementation of Authentication Algorithm
- Fix
- None yet
- No fixed version published
Exploited in the wild. Microsoft SharePoint Server Privilege Escalation Vulnerability (Microsoft SharePoint Server). Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Due for U.S. federal agencies by Jan 31, 2024. Known to be used in ransomware campaigns.
Description
Microsoft SharePoint Server Elevation of Privilege Vulnerability
How to fix
No fixed version has been published yet. Until one is, remove or replace the package, or turn off or isolate the affected feature. This page updates when a fix ships.
Severity breakdown
CVSS 3.1 9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Weakness
CWE-303: Incorrect Implementation of Authentication Algorithm
The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.
References
Advisories
Other links
Timeline
- Published
- Added to CISA's Known Exploited Vulnerabilities catalog
- Remediation due for U.S. federal agencies
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-wrhw-j3f9-8vc6 [mcp-atlassian] Authentication bypass in HTTP transport: AtlassianOpaqueTokenVerifier accepts any non-empty token | Critical | Same weakness, CWE-303 |
| GHSA-4j6x-2764-m8gh Rancher has over-inclusive team membership expansion in GitHub App authentication provider | High | Same weakness, CWE-303 |
| GHSA-4jcj-7x88-m979 LiteLLM: MCP Proxy Has Improper Authentication | Critical | Same weakness, CWE-303 |
| GHSA-x527-x647-q7gg golang.org/x/crypto: Invoking VerifiedPublicKeyCallback permissions skip enforcement | Critical | Same weakness, CWE-303 |
| GHSA-83c4-ffjp-mxp9 Keycloak: Revoked Tokens Can Remain Active When Both Realm-Level and Client-Level `notBefore` Revocation Policies are Configured | Medium | Same weakness, CWE-303 |
| GHSA-vp29-5652-4fw9 CoreDNS has TSIG authentication bypass on gRPC and QUIC transports | Critical | Same weakness, CWE-303 |
| GHSA-qhmp-q7xh-99rh CoreDNS has TSIG authentication bypass on DoT, DoH, DoH3, DoQ, and gRPC | High | Same weakness, CWE-303 |
| GHSA-fg35-5rf6-qg3g Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw | Medium | Same weakness, CWE-303 |
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