CVE-2026-21223
CVE-2026-21223 is a high-severity vulnerability in Microsoft Edge Chromium with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-269.
Key facts
- Severity: High (CVSS 3.x base score 7.1)
- EPSS exploit prediction: 0% (16th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-3111
- Weakness: CWE-269
- Affected product: Microsoft Edge Chromium
- Published:
- Last modified:
Description
Improper privilege management in Microsoft Edge (Chromium-based) allows an authorized attacker to bypass a security feature locally.
Frequently asked questions
- What is CVE-2026-21223?
- Improper privilege management in Microsoft Edge (Chromium-based) allows an authorized attacker to bypass a security feature locally.
- How severe is CVE-2026-21223?
- CVE-2026-21223 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2026-21223 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-21223?
- CVE-2026-21223 affects Microsoft Edge Chromium. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-21223?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-21223 have an EU (EUVD) identifier?
- Yes. CVE-2026-21223 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3111.
- When was CVE-2026-21223 published?
- CVE-2026-21223 was published on 2026-01-16 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*
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