How severe is CVE-2025-53771?

CVE-2025-53771 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-53771 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 100% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-53771?

CVE-2025-53771 primarily affects Microsoft Sharepoint Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-53771?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-53771 have an EU (EUVD) identifier?

Yes. CVE-2025-53771 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22040.

When was CVE-2025-53771 published?

CVE-2025-53771 was published on 2025-07-20 and last updated on 2026-06-17.

CVE-2025-53771

CVE-2025-53771 is a medium-severity vulnerability in Microsoft Sharepoint Server with a CVSS 3.x base score of 6.5. Its EPSS exploit-prediction score of 100% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-287.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 100% (100th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-22040
Weakness: CWE-287
Affected product: Microsoft Sharepoint Server
Published: 2025-07-20
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2025-53771?: Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
How severe is CVE-2025-53771?: CVE-2025-53771 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-53771 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 100% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-53771?: CVE-2025-53771 primarily affects Microsoft Sharepoint Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-53771?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-53771 have an EU (EUVD) identifier?: Yes. CVE-2025-53771 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22040.
When was CVE-2025-53771 published?: CVE-2025-53771 was published on 2025-07-20 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Sharepoint Server

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CVE-2023-29357 — Critical (CVSS 9.8): Microsoft SharePoint Server Elevation of Privilege Vulnerability

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →