CVE-2026-22813: Malicious website can execute commands on the local system through XSS in the OpenCode web UI

January 13, 2026

A malicious website can abuse the server URL override feature of the OpenCode web UI to achieve cross-site scripting on http://localhost:4096. From there, it is possible to run arbitrary commands on the local system using the /pty/ endpoints provided by the OpenCode API.

References

github.com/advisories/GHSA-c83v-7274-4vgp
github.com/anomalyco/opencode
github.com/anomalyco/opencode/security/advisories/GHSA-c83v-7274-4vgp
nvd.nist.gov/vuln/detail/CVE-2026-22813

Code Behaviors & Features

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