Threats / Microsoft / CVE-2023-24955
CVE-2023-24955
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft SharePoint Server vulnerability
Microsoft SharePoint Server contains a code injection vulnerability allowing authenticated Site Owners to execute arbitrary code remotely.
Verdict
Today item, not a backlog item.
High-severity code injection in SharePoint Server exploited in active ransomware campaigns. Requires Site Owner privileges but enables complete system compromise. Patch immediately.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Public proof-of-concept exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
5 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-03-26), flagged for known ransomware use.
Probability (EPSS)
EPSS 0.85395 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Microsoft, SharePoint Server. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-94 Code Injection — weakness family: Injection.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
Gain Site Owner access through credential compromise or insider access
Business
Attacker establishes foothold with legitimate-appearing administrative privileges
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
Inject malicious code through SharePoint Server interfaces to execute arbitrary commands
Business
Attacker achieves code execution within the SharePoint application context
3
Lateral reach — past segmentation narrative 3
Attacker
Execute ransomware payload or lateral movement commands on the compromised server
Business
Organization experiences data encryption, service disruption, and potential extortion demands
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05