KEV Entry

CVE-2026-55040

Known Exploited Vulnerability Entry Previdian

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Entry Details
Confirmed Exploited

CVE-2026-55040

2026-08-12 21:37 CEST

Timestamps

2026-08-12

2026-08-12

Scope

Microsoft SharePoint Server Security Feature Bypass Vulnerability | Affected: Microsoft / Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition | CVSS: 9.1 (CRITICAL) | EPSS: 0.17535 | Used in malware: unknown | Listed 7 days ahead of CISA KEV | Not yet in CISA KEV: False

References
  • {'id': 'CVE-2026-55040', 'url': 'https://www.cve.org/CVERecord?id=CVE-2026-55040'}
  • {'id': 'GHSA-GRXW-7CVC-96RV', 'url': 'https://github.com/advisories/GHSA-GRXW-7CVC-96RV'}
  • {'id': 'previdian', 'url': 'https://previdian.com/CVE-2026-55040'}

1c4d902f-03d7-40f9-a428-0fb8587dbd7c

Previdian
caeb2787-0d58-4236-9039-7c86c3e566f3

2026-10-02 09:09 CEST

2026-10-02 09:09 CEST

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report previdian successful_exploitation 0.70
View details 
{
  "added_date": "2026-08-12T19:37:46.763Z",
  "ahead_of_cisa_kev": {
    "count": 7,
    "unit": "day"
  },
  "cve_id": "CVE-2026-55040",
  "cvss_estimated": false,
  "cvss_score": 9.1,
  "cvss_severity": "CRITICAL",
  "epss_percentile": 0.97051,
  "epss_score": 0.17535,
  "feed": "Previdian (previdian.com)",
  "ghsa_id": "GHSA-GRXW-7CVC-96RV",
  "not_yet_in_cisa_kev": false,
  "previous_ids": [],
  "product": "Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition",
  "title": "Microsoft SharePoint Server Security Feature Bypass Vulnerability",
  "used_in_malware": "unknown",
  "vendor": "Microsoft",
  "virtual_patch": false,
  "vulnerability_id": "CVE-2026-55040"
}
 -
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