Microsoft Edge (Chromium-based) Information Disclosure Vulnerability
CVE-2025-49741 is an information disclosure vulnerability in Microsoft Edge (Chromium-based). Microsoft describes the issue at a high level as allowing an unauthorized attacker to disclose information over a network. Available authoritative details indicate network attackability, low attack complexity, no privileges required, and required user interaction. The affected product is Chromium-based Microsoft Edge, and Microsoft provided an official fix in Edge version 135.0.3179.98, released on 2025-04-25. Additional third-party claims in the supplied content about specific middleware header handling and x-middleware-subrequest validation are inconsistent with the Microsoft advisory context and are not sufficiently reliable to attribute as the vulnerable mechanism.
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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.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Edge (Chromium-based) information disclosure vulnerability referenced in the advisory section.
An information disclosure vulnerability described as involving improper validation of the x-middleware-subrequest HTTP header, enabling bypass of middleware logic and unauthorized access to sensitive data. The content is internally inconsistent because the patch section refers to Windows Remote Desktop Services and unintended code execution while the affected product section refers to Microsoft Edge.
An information disclosure vulnerability in Microsoft Edge (Chromium-based) that allows an unauthorized attacker to disclose information over a network.
The version that knows your environment.
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.