[Update] Multiple vulnerabilities in Microsoft SharePoint (July 21, 2025)

unknownpublic exploitCVE-2025-53770 CVE-2025-53771

[Update on July 23, 2025] On July 20, 2025, Microsoft released patches for a vulnerability of insufficient path traversal affecting SharePoint Enterprise Server 2016, SharePoint Server 2019 and...

CSIRTS triage

vendor: Microsoft product: SharePoint Server Path traversalaffected: SharePoint Enterprise Server 2016, SharePoint Server 2019

What: There is a vulnerability of insufficient path traversal.
Who is affected: Deployments of SharePoint Enterprise Server 2016 and SharePoint Server 2019.
Urgency: Remediation is urgent due to confirmed exploitation.
Action: Apply the patches released on July 20, 2025.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-FR Alertes de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2025-07-21
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/alerte/CERTFR-2025-ALE-010/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Exploitation likely imminentCVE-2025-53770EPSS puts this in the most-targeted tier (100.0% 30-day exploitation probability). Prioritize alongside KEV items. Riskier than 100% of all scored CVEs.
Exploitation likely imminentCVE-2025-53771EPSS puts this in the most-targeted tier (99.9% 30-day exploitation probability). Prioritize alongside KEV items. Riskier than 100% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-53770	coverage & exploitation status	NVD · CVE.org
CVE-2025-53771	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

criticalexploitedCVE-2025-53770: Microsoft SharePoint Deserialization of Untrusted Data Vulnerabilitycisa-kev

Recent advisories for Microsoft SharePoint

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

criticalexploitedAL26-015 - Critical vulnerability impacting Microsoft SharePoint Server – CVE-2026-45659cccs · 2026-07-02
high[UPDATE] [high] Microsoft SharePoint Server 2016 and SharePoint Server 2019: Vulnerability allows code executi…cert-bund · 2026-07-02
criticalexploitedCVE-2026-45659: Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerabilitycisa-kev · 2026-07-01
mediumCVE-2026-45467: Microsoft SharePoint Server Spoofing Vulnerabilitymsrc · 2026-06-09
mediumCVE-2026-45468: Microsoft SharePoint Server Spoofing Vulnerabilitymsrc · 2026-06-09
mediumCVE-2026-45479: Microsoft SharePoint Server Spoofing Vulnerabilitymsrc · 2026-06-09