EUVD-2026-43191Severity by source
AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Network-delivered but needs victim interaction (UI:R) and difficult-to-control conditions (AC:H); no auth (PR:N); deserialization RCE with sandbox escape yields S:C and full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Deserialization of untrusted data in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Edge (Chromium-based) lets an unauthenticated network attacker run arbitrary code by luring a victim into interacting with crafted content that triggers unsafe deserialization (CWE-502). The flaw carries CVSS 8.3 with a scope change, meaning successful exploitation can break out of the browser's security boundary, though there is no public exploit identified at time of analysis and Microsoft has already shipped a fix.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to interact with attacker-controlled content in Microsoft Edge (UI:R) - e.g., visiting a malicious page or opening crafted content - and the attack has high complexity (AC:H), meaning it depends on conditions outside the attacker's direct control (such as specific timing, memory state, or configuration) that are not fully detailed in the description. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mixed toward a real-but-not-emergency priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker hosts a malicious web page or delivers crafted content and social-engineers a victim into opening it in Microsoft Edge; the content triggers unsafe deserialization, and if the high-complexity conditions are met, the attacker executes arbitrary code and breaks out of the browser boundary. Given AC:H and UI:R, this most plausibly appears as a targeted or watering-hole-style attack rather than mass exploitation. … |
| Remediation | Patch available per vendor advisory - update Microsoft Edge (Chromium-based) to the latest Stable channel build via the browser's built-in updater (edge://settings/help) or enterprise update management, per Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58281; the exact fixed version is not provided in the input and should be confirmed from that advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Issue alert restricting Edge usage to essential sites only; recommend users defer non-critical browsing pending patch deployment. …
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Remote code execution in Microsoft Edge (Chromium-based) allows an unauthorized attacker to break out of the browser's s
Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
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