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Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M

CVE-2026-62283Nezha Monitoring: Cross-tenant terminal/file-manager session hijack via WebSocket stream UUID without ownership check

Critical 9.9

In plain English

A critical-severity authorization bypass via user-controlled key in nezha from nezhahq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.9Critical
Exploit odds (30 days)0.6%top 53.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. Nezha versions 1.14.13 through 1.14.14 and 2.0.0 through 2.0.9 do not bind stream identifiers created by CreateStream in service/rpc/io_stream.go to their creating user, and `GET /ws/terminal/:id` and `GET /ws/file/:id` only check whether the supplied UUID exists. An authenticated RoleMember who obtains a live stream UUID from logs, browser history, referer data, or telemetry can attach to another user's terminal or file-manager session, read and write target-server files, and execute shell commands. This issue is fixed in version 2.0.10.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/nezhahq/nezhano fix listedGHSA-q6xx-5vr8-p898
Gogithub.com/nezhahq/nezha2.0.10GHSA-q6xx-5vr8-p898
Gogithub.com/nezhahq/nezhano fix listedGO-2026-5821
Gogithub.com/nezhahq/nezhano fix listedGO-2026-5821

Affected products (as reported)

VendorProductVersions
nezhahq nezha >= 1.14.13, <= 1.14.14>= 2.0.0, < 2.0.10

Weakness: CWE-639, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References