CVE-2026-55437
mediumpriority · track · 0EPSS 0.003 · 24 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
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base score 0–10 · higher = more severe · hover a vector to decode
ssvc
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weaknesses
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affected products (13)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- GHSA-7qw2-f75v-62f7Coder vulnerable to stored HTML injection via workspace agent logs in AgentLogLine component2026-07-06ghsa · osvUS
### 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!
- GO-2026-5919Coder vulnerable to stored HTML injection via workspace agent logs in AgentLogLine component in github.com/coder/coder2026-07-07vendor · osvUS
Coder vulnerable to stored HTML injection via workspace agent logs in AgentLogLine component in github.com/coder/coder
also known as (5)
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sources
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references (19)
External citations — patches, advisories, analysis.
- https://github.com/coder/coder/pull/25808cnnvd
- https://github.com/coder/coder/releasesPatchcnnvd
- https://github.com/coder/coder/releases/tag/v2.29.17cnnvd
- https://github.com/coder/coder/releases/tag/v2.32.7cnnvd
- https://github.com/coder/coder/releases/tag/v2.33.8cnnvd
- https://github.com/coder/coder/releases/tag/v2.34.2cnnvd
- https://github.com/coder/coder/security/advisories/GHSA-7qw2-f75v-62f7cnnvd
- https://github.com/coder/coder/pull/25808enisa_euvd
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