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CVE-2026-55945 is an improper-synchronization race condition in Microsoft Edge (Chromium-based). The condition can be exploited during the interaction between Edge AI agent think and act modes, enabling an authorized local attacker to disclose information. The demonstrated attack chain involved a malicious, ordinarily permissioned browser extension controlling a Microsoft page authorized to prompt Edge AI and exploiting the race to influence the agent.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A medium-severity Microsoft Edge race condition affecting versions before 150.0.4078.48. The BragJack proof of concept races Copilot’s separate prompt-intake and browser-action modes to force execution of an attacker-controlled prompt.
A Microsoft Edge built-in AI-agent prompt-execution issue. The researchers reportedly combined control of a Microsoft marketing page trusted to send Edge AI prompts with a race condition that switched the agent from think mode to act mode, causing it to execute an attacker prompt. It requires a malicious extension already running in the victim's browser.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.