Multiple vulnerabilities in Microsoft Sharepoint (July 22, 2026)
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.
On July 14, 2026, during its monthly update, Microsoft released, among other things, patches for two critical vulnerabilities affecting SharePoint. The vulnerabilities CVE-2026-50522 and CVE-2026-58644 allow an unauthenticated attacker to execute arbitrary code at...
CSIRTS triage
- What
- The vulnerabilities allow an unauthenticated attacker to execute arbitrary code.
- Who is affected
- Deployments of Microsoft SharePoint.
- Urgency
- Remediation is urgent due to confirmed exploitation of the vulnerabilities.
- Action
- Apply the patches released on July 14, 2026.
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-2026-ALE-008/
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-2026-50522Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all scored CVEs.
- Exploitation confirmedCVE-2026-58644Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 93% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-50522 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-58644 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedSecurity Alert: [Updated] Microsoft Releases July 2026 Security Updatesjpcert
- criticalexploitedMicrosoft security advisory – July 2026 monthly rollup (AV26-698) – Update 3cccs
- criticalexploited2026-009: Critical Vulnerabilities in Microsoft SharePointcert-eu
- highexploitedCISA Adds Two Known Exploited Vulnerabilities to Catalogcisa
- criticalexploitedCVE-2026-50522: Microsoft SharePoint Deserialization of Untrusted Data Vulnerabilitycisa-kev
- unknownexploitedNCSC-2026-0237 [1.02] [H/H] Vulnerabilities Fixed in Microsoft Officencsc-nl
- unknownexploitedNCSC-2026-0237 [1.01] [H/H] Vulnerabilities fixed in Microsoft Officencsc-nl
- highexploitedCISA Adds Three Known Exploited Vulnerabilities to Catalogcisa
- criticalexploitedCVE-2026-58644: Microsoft SharePoint Deserialization of Untrusted Data Vulnerabilitycisa-kev
- criticalexploitedAL26-017 - Critical vulnerabilities impacting Microsoft SharePoint Server – CVE-2026-56164, CVE-2026-55040 and…cccs
- unknownMultiple vulnerabilities in Microsoft products (July 15, 2026)cert-fr-avis
- unknownexploitedNCSC-2026-0237 [1.00] [M/H] Vulnerabilities fixed in Microsoft Officencsc-nl
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.
- criticalexploited2026-009: Critical Vulnerabilities in Microsoft SharePointcert-eu · 2026-07-23
- criticalexploitedCVE-2026-50522: Microsoft SharePoint Deserialization of Untrusted Data Vulnerabilitycisa-kev · 2026-07-22
- medium[NEW] [medium] Microsoft SharePoint and SharePoint Server: Vulnerability allows Cross-Site Scriptingcert-bund · 2026-07-17
- mediumCVE-2026-62826: Improper neutralization of input during web page generation ('cross-site scripting') in Micros…nvd · 2026-07-16
- criticalexploitedCVE-2026-58644: Microsoft SharePoint Deserialization of Untrusted Data Vulnerabilitycisa-kev · 2026-07-16
- criticalexploitedAL26-017 - Critical vulnerabilities impacting Microsoft SharePoint Server – CVE-2026-56164, CVE-2026-55040 and…cccs · 2026-07-15
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