VulnerabilityAnalyzed

CVE-2025-53771

Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.

MEDIUM 6.5EPSS 99.7%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 99.7%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.

Description

Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.

CVSS 3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS: 99.73% probability · 100th percentile
CISA KEV: Not listed
Weakness: CWE-287
Affected: microsoft/sharepoint server
Source: secure@microsoft.com

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53771Vendor Advisory
https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/Press/Media Coverage

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.