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CVE-2026-45492 is a security bypass vulnerability in Microsoft Edge caused by insufficient validation of the origin of web content within the browser’s cross-device managed sign-in mechanism. A remote attacker can trigger the flaw by inducing a target to visit a malicious page or open a malicious file, allowing access to restricted functionality that should not be available to untrusted content. The issue is characterized as an origin validation error and affects Edge-specific functionality rather than generic upstream Chromium behavior. The vulnerability can also serve as a building block in exploit chains with other browser flaws.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Edge vulnerability caused by insufficient origin validation in cross-device managed sign-in, potentially exposing restricted functionality and enabling chaining with other issues.
A sibling Microsoft Edge-only vulnerability remediated in the same May 15, 2026 Edge build as CVE-2026-45495; no further technical details are provided in the content.
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.