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Use-After-Free RCE in Microsoft Edge (Chromium-based)

IdentifiersCVE-2026-50521CWE-416

CVE-2026-50521 is a high-severity use-after-free vulnerability in Microsoft Edge (Chromium-based). The flaw can allow code execution over a network and is described by Microsoft as affecting Edge versions prior to 149.0.4022.98. The available information indicates the issue is memory-safety related, specifically a use-after-free condition, which can permit an attacker to corrupt process memory and achieve code execution in the context of the browser. CVSS information provided in the supporting content indicates low attack complexity, no privileges required, required user interaction, unchanged scope, and high impacts to confidentiality, integrity, and availability.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can result in remote code execution on the targeted system in the security context of the Microsoft Edge browser process. Given the provided CVSS characteristics, exploitation may enable compromise of confidentiality, integrity, and availability of data accessible to the browser session. Because user interaction is required, exploitation likely depends on convincing a user to open or interact with attacker-controlled web content.

Mitigation

If you can’t patch tonight, do this now.

No specific workaround or temporary mitigation was provided in the cited advisory. The practical mitigation is to apply all available Microsoft Edge updates promptly. Until patching is complete, reduce exposure by limiting access to untrusted web content and enforcing browser hardening controls where operationally feasible, though these are not vendor-provided mitigations.

Remediation

Patch, then assume compromise.

Upgrade Microsoft Edge (Chromium-based) to version 149.0.4022.98 or later. The advisory also states customers should install all applicable Microsoft-provided updates associated with the fix. Prioritize patching all systems running affected Edge versions prior to 149.0.4022.98.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Microsoft CorporationEdgeapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

9 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity7

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-50521
NVD
nvd.nist.gov/vuln/detail/CVE-2026-50521
MITRE CWE · CWE-416
cwe.mitre.org