[Update] Multiple vulnerabilities in Microsoft SharePoint (July 21, 2025)
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
[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
- 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
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 confirmedCVE-2025-53770Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.9% of all EPSS-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 99.9% of all EPSS-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.
- criticalexploitedCVE-2026-55040: Microsoft SharePoint Weak Authentication Vulnerabilitycisa-kev · 2026-08-18
- highCVE-2026-70355: Improper neutralization of input during web page generation ('cross-site scripting') in Micros…nvd · 2026-08-11
- highCVE-2026-70326: Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacke…nvd · 2026-08-11
- highCVE-2026-70324: Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacke…nvd · 2026-08-11
- highCVE-2026-70321: Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker…nvd · 2026-08-11
- criticalCVE-2026-70306: Improper neutralization of input during web page generation ('cross-site scripting') in Micros…nvd · 2026-08-11
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