---
id: CVE-2026-55437
aliases:
  - GHSA-7qw2-f75v-62f7
title: >-
  Coder vulnerable to stored HTML injection via workspace agent logs in
  AgentLogLine component
summary: >-
  Coder vulnerable to stored HTML injection via workspace agent logs in
  AgentLogLine component
severity: medium
cvss: 5.4
cwe:
  - CWE-79
vendor: coder
product: github.com/coder/coder/v2
ecosystem: go
affected:
  - 'github.com/coder/coder/v2 >= 2.34.0, < 2.34.2'
  - 'github.com/coder/coder/v2 >= 2.33.0, < 2.33.8'
  - 'github.com/coder/coder/v2 >= 2.30.0, < 2.32.7'
  - github.com/coder/coder/v2 < 2.29.17
patched:
  - github.com/coder/coder/v2 2.34.2
  - github.com/coder/coder/v2 2.33.8
  - github.com/coder/coder/v2 2.32.7
  - github.com/coder/coder/v2 2.29.17
published: '2026-07-06'
updated: '2026-07-06'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-7qw2-f75v-62f7'
references:
  - url: 'https://github.com/coder/coder/security/advisories/GHSA-7qw2-f75v-62f7'
  - url: 'https://github.com/coder/coder/pull/25808'
  - url: 'https://github.com/advisories/GHSA-7qw2-f75v-62f7'
tags:
  - ghsa
  - go
ingestedAt: '2026-07-06T21:45:52.943Z'
epss: 0.00316
epssPercentile: 0.21813
---

## Overview

### Summary

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.

### Impact

A user who could run a workspace could emit arbitrary HTML into agent logs; when another user, including an administrator, viewed the workspace page, it rendered in their session. Content Security Policy blocked inline scripts but an attacker could still inject a `meta refresh` redirect, `style` rules for UI redressing or CSS-based exfiltration or external `img` beacons. This required workspace-owner access and a victim viewing the page.

### Patches

The fix enables `escapeXML: true` so HTML metacharacters are escaped before DOM insertion.

The fix was backported to all supported release lines:

| Release line | Patched version |
|---|---|
| 2.34 | [v2.34.2](https://github.com/coder/coder/releases/tag/v2.34.2) |
| 2.33 | [v2.33.8](https://github.com/coder/coder/releases/tag/v2.33.8) |
| 2.32 | [v2.32.7](https://github.com/coder/coder/releases/tag/v2.32.7) |
| 2.29 (ESR) | [v2.29.17](https://github.com/coder/coder/releases/tag/v2.29.17) |

### Workarounds

None.

### Resources

- Fix: #25808

### Credits

Coder would like to thank Anthropic's Security Team (ANT-2026-22449) for independently disclosing this issue!

## Affected packages

- `github.com/coder/coder/v2 >= 2.34.0, < 2.34.2`
- `github.com/coder/coder/v2 >= 2.33.0, < 2.33.8`
- `github.com/coder/coder/v2 >= 2.30.0, < 2.32.7`
- `github.com/coder/coder/v2 < 2.29.17`

## Remediation

Upgrade to a patched release:

- `github.com/coder/coder/v2 2.34.2`
- `github.com/coder/coder/v2 2.33.8`
- `github.com/coder/coder/v2 2.32.7`
- `github.com/coder/coder/v2 2.29.17`