# Microsoft SharePoint Server Privilege Escalation · pwn.watch

> 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 the CISA KEV catalog on 2024-01-10. CISA lists known use in ransomware campaigns. CVE-2023-29357 was assigned before 2024; the KEV listing came in 2024.

Page: https://pwn.watch/i/microsoft-sharepoint-server-cve-2023-29357 · generated 2026-10-23T01:02:50.524Z

## Status
- Severity: critical · status: closed · patch: patched
- Product: Microsoft SharePoint Server
- Started: 2024-01-10 · closed: 2024-01-10
- CVEs: CVE-2023-29357
- Affected: See vendor advisory (versions are not listed in the KEV record)
- Fixed in: See vendor advisory linked in sources

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/microsoft-sharepoint-server-cve-2023-29357/feed.xml
- JSON Feed: https://pwn.watch/i/microsoft-sharepoint-server-cve-2023-29357/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/microsoft-sharepoint-server-cve-2023-29357.json
- This file: https://pwn.watch/i/microsoft-sharepoint-server-cve-2023-29357/llms.txt

## Updates (newest first)
- 2024-01-10: CISA added CVE-2023-29357 to the KEV catalog (federal deadline 2024-01-31) (https://www.cisa.gov/known-exploited-vulnerabilities-catalog)

## Fix brief
# Security brief: Microsoft SharePoint Server Privilege Escalation

Source: https://pwn.watch/i/microsoft-sharepoint-server-cve-2023-29357 · status: closed (closed Jan 10, 2024) · severity: critical · updated Jan 10, 2024

## Patch status
**PATCHED: fixed releases exist. Upgrade to a fixed version.**

## What it is
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 the CISA KEV catalog on 2024-01-10. CISA lists known use in ransomware campaigns. CVE-2023-29357 was assigned before 2024; the KEV listing came in 2024.

Severity detail: CVSS 9.8 (v3.1, CNA), actively exploited (CISA KEV); known ransomware use

- Product: Microsoft SharePoint Server
- CVE / advisory ids: CVE-2023-29357

## Affected versions
- See vendor advisory (versions are not listed in the KEV record)

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- See vendor advisory linked in sources

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Secrets to rotate
This incident involves possible credential exposure. Rotate any credentials (API keys, tokens, env vars, SSH keys) that were present on affected systems or in affected builds while vulnerable/compromised versions were installed, and review access logs.

## Latest updates
- Jan 10, 2024: CISA added CVE-2023-29357 to the KEV catalog (federal deadline 2024-01-31)

## Advisories
- [Microsoft advisory: CVE-2023-29357](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29357) (Microsoft)
- [NVD: CVE-2023-29357](https://nvd.nist.gov/vuln/detail/CVE-2023-29357) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## Caveats
Derived from the CISA KEV JSON feed (catalogVersion 2026.10.21); CVSS from the CVE record (cveawg.mitre.org). startedAt is the CVE publication date when it fell in 2024 before the KEV listing, else the KEV dateAdded; exploitation may have begun earlier. closedAt is the KEV listing date (a fix or mitigation was available then unless noted).

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Machine-readable: https://pwn.watch/i/microsoft-sharepoint-server-cve-2023-29357.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.