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Microsoft Edge Cross-Device Managed Sign-In Origin Validation Security Bypass

IdentifiersCVE-2026-45492CWE-346

CVE-2026-45492 is a security bypass vulnerability in Microsoft Edge (Chromium-based) affecting the cross-device managed sign-in mechanism. The flaw is caused by insufficient validation of the origin of web content, allowing an unauthorized remote attacker to bypass an intended security restriction and access restricted functionality. Public reporting describes the issue as an origin validation error / improper input validation condition within the managed sign-in workflow. Exploitation requires user interaction: the target must visit a malicious page or open a malicious file. The issue is rated CVSS 4.3 and was disclosed by Orange Tsai of the DEVCORE Research Team.

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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 allows a remote attacker to bypass a security feature in Edge and gain access to restricted functionality exposed by the vulnerable cross-device managed sign-in flow. On its own, the published impact is limited to integrity-related security bypass rather than direct confidentiality loss, availability loss, or standalone code execution. However, the flaw can be chained with other vulnerabilities to expand attacker capability, including potentially enabling arbitrary code execution in the context of the current user when combined with a suitable secondary issue.

Mitigation

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

Until patched, reduce exposure by limiting user interaction with untrusted web content and files, including blocking or closely scrutinizing malicious or unexpected links, attachments, and downloaded files that could open in Edge. Enterprise defenders should monitor for suspicious browser-driven authentication or sign-in flows and avoid chaining opportunities by promptly remediating other browser and endpoint vulnerabilities. Least-privilege user operation can reduce downstream impact if the issue is combined with another flaw.

Remediation

Patch, then assume compromise.

Apply the Microsoft Edge security update released by Microsoft for CVE-2026-45492. Microsoft has issued a vendor fix correcting the origin validation weakness in the cross-device managed sign-in mechanism. Update Edge through the normal Microsoft Edge update channel or Microsoft Update, and apply any related operating system updates if prompted as part of the servicing chain.
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 CorporationEdge Chromiumapplication

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

ACTIVITY FEED

Recent activity

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

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

The version that knows your environment.

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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 activity8

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-45492
NVD
nvd.nist.gov/vuln/detail/CVE-2026-45492
MITRE CWE · CWE-346
cwe.mitre.org
Vendor Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45492