CVE-2026-55437: Coder vulnerable to stored HTML injection via workspace agent logs in AgentLogLine component

July 6, 2026

The AgentLogLine dashboard component instantiated ansi-to-html without escapeXML: true and inserted the result via dangerouslySetInnerHTML so HTML embedded in workspace agent log lines was rendered as live markup. Server-side sanitization did not neutralize HTML metacharacters.

Note: Exploitation requires a victim to view attacker-controlled agent logs in the dashboard.

References

github.com/advisories/GHSA-7qw2-f75v-62f7
github.com/coder/coder/pull/25808
github.com/coder/coder/security/advisories/GHSA-7qw2-f75v-62f7
nvd.nist.gov/vuln/detail/CVE-2026-55437

Code Behaviors & Features

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