CVE-2026-50521
CVE-2026-50521 is a high-severity vulnerability in Microsoft Edge Chromium with a CVSS 3.x base score of 8.3. 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-416.
Key facts
- Severity: High (CVSS 3.x base score 8.3)
- EPSS exploit prediction: 1% (53rd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-416
- Affected product: Microsoft Edge Chromium
- Published:
- Last modified:
Description
Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.
Frequently asked questions
- What is CVE-2026-50521?
- Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.
- How severe is CVE-2026-50521?
- CVE-2026-50521 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability low.
- Is CVE-2026-50521 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-50521?
- CVE-2026-50521 affects Microsoft Edge Chromium. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-50521?
- 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.
- When was CVE-2026-50521 published?
- CVE-2026-50521 was published on 2026-07-01 and last updated on 2026-07-03.
References
Affected products (1)
- cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*
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- CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
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