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webpack-dev-server contains an unintended proxy/intermediary vulnerability when a user-defined proxy configuration has an overly broad context, such as "/", and enables WebSocket forwarding with "ws: true". The proxy can intercept the development server's own Hot Module Replacement (HMR) WebSocket connection and forward it to the configured backend target. This causes browser cookies and the Origin header associated with the HMR connection to be disclosed to that backend, bypasses the development server's Host and Origin validation, and results in both the HMR implementation and proxy attempting to write to the same socket.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Information disclosure and denial of service in webpack-dev-server through improper proxy configuration.
An information disclosure and denial-of-service vulnerability in webpack-dev-server caused by improper proxy configuration.
A webpack-dev-server flaw causing information disclosure and denial of service through improper proxy configuration.
A webpack-dev-server vulnerability causing information disclosure and denial of service via improper proxy configuration.
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.