CVE-2025-49706
Microsoft SharePoint Improper Authentication Vulnerability
Microsoft SharePoint
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
Ransomware groups exploiting CVE-2025-49706
The Warlock ransomware and operator(s) are believed to be attributed to Storm-2603, a China-based threat actor who is also known to have deployed LockBit ransomware. There's also a crossover between victims with Black Basta. Both are RaaS and have a long list
Exploitation is attributed to these groups across their recorded activity. It does not follow that every organisation they listed was reached through CVE-2025-49706 — the source data does not record an entry point per incident.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 22 July 2025. US federal agencies were required to remediate it by 23 July 2025. CISA records this vulnerability as known to be used in ransomware campaigns.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 99.1%, which is higher than 99.9% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Recent listings by these groups
Disclosures from the groups above, newest first.
Frequently asked questions
Is CVE-2025-49706 being exploited by ransomware groups?
Yes. CVE-2025-49706 is recorded as exploited by Warlock. Between them these groups account for 78 victim disclosures in this database. CISA also records this vulnerability as used in ransomware campaigns.
What does CVE-2025-49706 affect?
CVE-2025-49706 affects Microsoft SharePoint. Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
How severe is CVE-2025-49706?
CVE-2025-49706 is rated MEDIUM with a CVSS base score of 6.5. EPSS puts the probability of exploitation in the next 30 days at 99.1%, higher than 99.9% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 23 July 2025.
How should organisations respond to CVE-2025-49706?
Apply the vendor patch for Microsoft SharePoint as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.