CVE-2026-8399
📛 CVE Title
CVE-2026-8399
Description
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
Overview
- State
- REJECTED
- Assigner (CNA)
- GitLab
- CVSS severity
- null
- CVSS score
- 9.8 / 10
- CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Effective score
- 9.8 / 10 NULL source: CNA overview
- CWE(s)
- —
- Reserved
- 2026-05-12
- Published
- —
- Last updated
- 2026-05-20 22:19 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/8xxx/CVE-2026-8399.json
- Linked Threat
- CVE-2026-8399 — CVE-2026-8399
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-20 23:16:35 UTC
- NVD last modified
- 2026-05-20 23:16:35 UTC
NVD / KEV / EPSS data refreshed 2026-05-25 00:35 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
Vendor references (0)
References embedded in the original CVE record by the assigning CNA.
None in the CVE record.
Web references (2)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://nvd.nist.gov/vuln/detail/CVE-2026-8399 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-8399 tenable:www.cve.org
Remediations (17)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:app.opencve.io
This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
2026-05-23 22:18 UTC -
web:blog.qualys.com
With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.
2026-05-23 22:18 UTC -
web:krebsonsecurity.com
Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.
2026-05-23 22:18 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-05-23 22:18 UTC -
web:www.crowdstrike.com
Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.
2026-05-23 22:18 UTC -
web:www.notebookcheck.net
Microsoft April 2026 Patch Tuesday fixes 167 vulnerabilities, including an actively exploited SharePoint zero-day. Windows 11 KB5083769 and KB5082052 bring new builds and RDP security.
2026-05-23 22:18 UTC -
web:www.techrepublic.com
Microsoft's April 2026 Patch Tuesday fixes 165 vulnerabilities, including two zero-days, in one of the company's largest monthly security updates.
2026-05-23 22:18 UTC -
web:www.thehackerwire.com
Frequently Asked Questions What is CVE-2026-8399 ? CVE-2026-8399 is a Info severity security vulnerability. Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority. How do I fix or mitigate CVE-2026-8399 ? When was CVE-2026-8399 disclosed? This vulnerability was publicly disclosed on May 20, 2026 .
2026-05-23 22:18 UTC -
web:www.windowslatest.com
Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.
2026-05-23 22:18 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-05-23 22:18 UTC -
web:4sysops.com
Starting in April 2026 , Windows updates will change the default Kerberos ticket issuance behavior to AES-SHA1 for accounts without explicit encryption settings, while RC4 can still be used where explicitly enabled. This change, driven by CVE - 2026 -20833, affects every Windows Server environment where service accounts or devices still rely on RC4. Any service account, NAS device, or legacy ...
2026-05-26 03:00 UTC -
web:blog.talosintelligence.com
Microsoft Patch Tuesday for October 2025 — Snort rules and prominent vulnerabilities Microsoft has released its monthly security update for October 2025, addressing 175 Microsoft CVEs and 21 non-Microsoft CVEs . Among these, 17 vulnerabilities are considered critical and 11 are flagged as important and considered more likely to be exploited.
2026-05-26 03:00 UTC -
web:cyberpress.org
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026 .
2026-05-26 03:00 UTC -
web:github.com
Microsoft Security Advisory CVE - 2026 -42899 - ASP.NET Core Denial of Service Vulnerability #397
2026-05-26 03:00 UTC -
web:windowsreport.com
Microsoft has released its May 2026 Patch Tuesday updates for Windows 11 and Windows 10, shipping as KB5089549 and KB5087544. The updates include fixes for more than 130 security vulnerabilities across Windows, Office, SharePoint, DNS components, and core system services, as Bleeping Computer writes. While no publicly disclosed zero-day vulnerabilities were reported this month, the […]
2026-05-26 03:00 UTC -
web:www.crowdstrike.com
Microsoft has released security updates for 130 vulnerabilities, including 30 critical, in its May 2026 Patch Tuesday rollout.
2026-05-26 03:00 UTC -
web:www.linkedin.com
Microsoft has released its May 2026 Patch Tuesday security updates, addressing more than 130 vulnerabilities across its software ecosystem, including Windows, Microsoft Office, SharePoint Server ...
2026-05-26 03:00 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-8399.json.
{
"containers": {
"cna": {
"providerMetadata": {
"dateUpdated": "2026-05-20T22:19:44.847Z",
"orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
"shortName": "GitLab"
},
"rejectedReasons": [
{
"lang": "en",
"value": "This CVE ID has been rejected or withdrawn by its CVE Numbering Authority."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
"assignerShortName": "GitLab",
"cveId": "CVE-2026-8399",
"dateRejected": "2026-05-20T22:19:44.847Z",
"dateReserved": "2026-05-12T13:34:42.529Z",
"dateUpdated": "2026-05-20T22:19:44.847Z",
"state": "REJECTED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}