2026-009 Critical Vulnerabilities in Microsoft SharePoint — CERT-EU-SA2026-009

Summary

[UPDATED] On 14 July 2026, Microsoft released security updates addressing critical remote code execution (RCE) vulnerabilities in Microsoft SharePoint Server. On 20 July 2026, WatchTowr identified a proof-of-concept exploit code and subsequently observed active exploitation of CVE-2026-50522, a vulnerability part of an ongoing series of actively exploited flaws affecting on-premise SharePoint Server instances,…

Timeline

Published by source

2026-07-23

Risk context

• The source data marks this issue as actively exploited; remediation should be prioritized.
• Reported severity or threat level: critical.
• Review exposure for the affected product or family: Security advisory.

Product

Security advisory

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Check logs/telemetry for indicators of compromise and suspicious activity.
• Consider temporary hardening: restrict access, reduce attack surface, and monitor aggressively.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

CERT-EU-SA2026-009

Source

CERT-EU

Vendor

CERT-EU

Published by source

2026-07-23

Last source activity

2026-07-23

Additional identifiers

CVE-2026-50522

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.