CVE-2025-53771
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 99.9%, 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
- 99.89% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- microsoft/sharepoint server
- Source
- secure@microsoft.com
EPSS 99.9% since 1 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.