Security Digest · Vulnerability record · Known exploited
CVE-2023-24955: Microsoft SharePoint Server Code Injection Vulnerability
Exploited in the wild (CISA KEV). Microsoft SharePoint Server Remote Code Execution Vulnerability
CISA KEV · added 2024-03-26 CVSS 7.2 High EPSS 85.0% · p99.7
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run Microsoft SharePoint Server. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-03-26, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-04-16; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns.
- EPSS 85.0%, percentile 99.7: FIRST’s model estimates a 85.0% chance of exploitation activity in the next 30 days, higher than 99.7% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs an account (high (admin)). Exposure depends on who can log in.
What it is
Microsoft SharePoint Server Remote Code Execution Vulnerability
CISA’s summary
Microsoft SharePoint Server contains a code injection vulnerability that allows an authenticated attacker with Site Owner privileges to execute code remotely.
Weakness type: CWE-94.
Product: Microsoft SharePoint Server · Assigned by: microsoft · Published: 2023-05-09
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0 < 16.0.5395.1000 |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 < 16.0.10398.20000 |
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 < 16.0.16130.20420 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoft | 3.1 | 7.2 High | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: high (admin)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2024-03-26; federal due date 2024-04-16. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 84.97% probability of exploitation activity in the next 30 days; percentile 99.7.
Timeline
- — CVE record published by microsoft
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Microsoft SharePoint Server Remote Code Execution Vulnerability msrc.microsoft.com
Vulnerability records
- CVE.org record CVE-2023-24955 cve.org
- NVD entry CVE-2023-24955 nvd.nist.gov
Government
All exploited Microsoft vulnerabilities · Today’s Security Digest