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Vulnerability · Published Jul 8, 2026 · Assigned by GitHub_M

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

Medium 5.4

In plain English

A medium-severity cross-site scripting in coder from coder. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.3%top 75.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/coder/coderno fix listedGO-2026-5919
Gogithub.com/coder/coder/v22.34.2GHSA-7qw2-f75v-62f7
Gogithub.com/coder/coder/v22.33.8GHSA-7qw2-f75v-62f7
Gogithub.com/coder/coder/v22.32.7GHSA-7qw2-f75v-62f7
Gogithub.com/coder/coder/v22.29.17GHSA-7qw2-f75v-62f7
Gogithub.com/coder/coder/v22.29.17, 2.32.7, 2.33.8, 2.34.2GO-2026-5919

Affected products (as reported)

VendorProductVersions
coder coder >= 2.34.0, < 2.34.2>= 2.33.0, < 2.33.8>= 2.30.0, < 2.32.7< 2.29.17

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References