What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-08 · updated 2026-07-08
• Weakness: CWE-79

Description

Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.17, 2.32.7, 2.33.8, and 2.34.2, 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. Exploitation requires a victim to view attacker-controlled agent logs in the dashboard. The fix in versions 2.29.17, 2.32.7, 2.33.8, and 2.34.2 enables `escapeXML: true` so HTML metacharacters are escaped before DOM insertion. No known workarounds are available.

Affected products

• coder: before 2.29.17; from 2.30.0 before 2.32.7; from 2.33.0 before 2.33.8; from 2.34.0 before 2.34.2 — fixed in 2.29.17, 2.32.7, 2.33.8, 2.34.2

How to fix

Upgrade to a fixed version: coder 2.29.17, 2.32.7, 2.33.8, 2.34.2. Check the vendor advisory for mitigations.

References

• https://github.com/coder/coder/pull/25808
• https://github.com/coder/coder/releases/tag/v2.29.17
• https://github.com/coder/coder/releases/tag/v2.32.7
• https://github.com/coder/coder/releases/tag/v2.33.8
• https://github.com/coder/coder/releases/tag/v2.34.2
• https://github.com/coder/coder/security/advisories/GHSA-7qw2-f75v-62f7

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