CVE-2023-24955: in the CISA KEV catalogue
Microsoft SharePoint Server Code Injection Vulnerability. CISA added CVE-2023-24955 to the Known Exploited Vulnerabilities catalogue on 2024-03-26 with a default due date of 2024-04-16. Known ransomware campaign use: Known. Forensic triage flag: No.
Microsoft SharePoint Server contains a code injection vulnerability that allows an authenticated attacker with Site Owner privileges to execute code remotely. (CISA description)
- Vendor / product
- Microsoft SharePoint Server
- CWE
- CWE-94
- CISA required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- EPSS
- 85%, percentile 99 (scored 2026-11-03)
EPSS puts about 85 in 100 odds (85%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2023-24955 in the CISA KEV catalogue?
Yes. CISA added CVE-2023-24955 (Microsoft SharePoint Server Code Injection Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2024-03-26. CISA's default due date for it is 2024-04-16.
Is CVE-2023-24955 used in ransomware attacks?
CISA marks known ransomware campaign use as Known for CVE-2023-24955.
What should I do about CVE-2023-24955?
CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2023-24955