EXECUTIVE SUMMARY:
CVE-2026-53519 with a CVSS score of 9.1 is a vulnerability affecting the Nezha Monitoring framework in affected versions. This flaw stems from a path traversal vulnerability in the dashboard NoRoute handler, where the application improperly validates URL prefixes using a simple string check rather than a path-segment match. An unauthenticated attacker can exploit this issue by sending a malicious GET request utilizing a dashboard prefix, which bypasses usual directory traversal defenses because the path traversal sequence is constructed only after the application strips the prefix. Successful exploitation allows the attacker to read sensitive server-side files, specifically extracting the HS256 JWT secret key used to sign session cookies. This capability enables the attacker to forge valid administrative tokens, leading to complete compromise of the dashboard, full system takeover. The consequences include unauthorized access to all monitoring data, controls. Exploitation requires no prior authentication but relies on the application running with default configurations where the sensitive configuration file is accessible at the anticipated path.[/subscribe_to_unlock_form]
EXECUTIVE SUMMARY:
CVE-2026-53519 with a CVSS score of 9.1 is a vulnerability affecting the Nezha Monitoring framework in affected versions. This flaw stems from a path traversal vulnerability in the dashboard NoRoute handler, where the application improperly validates URL prefixes using a simple string check rather than a path-segment match. An unauthenticated attacker can exploit this issue by sending a malicious GET request utilizing a dashboard prefix, which bypasses usual directory traversal defenses because the path traversal sequence is constructed only after the application strips the prefix. Successful exploitation allows the attacker to read sensitive server-side files, specifically extracting the HS256 JWT secret key used to sign session cookies. This capability enables the attacker to forge valid administrative tokens, leading to complete compromise of the dashboard, full system takeover. The consequences include unauthorized access to all monitoring data, controls. Exploitation requires no prior authentication but relies on the application running with default configurations where the sensitive configuration file is accessible at the anticipated path.[emaillocker id="1283"]
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