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MEDIUM severity

Coder vulnerable to stored HTML injection via workspace agent logs in AgentLogLine componentGHSA-7qw2-f75v-62f7

MEDIUMFix: coder/coder#25808

GHSA-7qw2-f75v-62f7 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in github.com/coder/coder/v2. A fix is available for github.com/coder/coder/v2 — see the affected versions and patch details below.

Also known asCVE-2026-55437GO-2026-5919
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Oct 24, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-7qw2-f75v-62f7.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs23th percentile — riskier than 23% of all scored CVEsHighest risk
0.00%0.27%0.54%0.82%0.2%0.3%0.3%0.3%Aug 26Oct 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-7qw2-f75v-62f7 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 395,249 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

4 pkgs affected
🐹github.com/coder/coder/v2🐹github.com/coder/coder/v2🐹github.com/coder/coder/v2🐹github.com/coder/coder/v2

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

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 linePatched version
2.34v2.34.2
2.33v2.33.8
2.32v2.32.7
2.29 (ESR)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

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/coder/coder/v2≥ 2.34.0&&< 2.34.22.34.2go get github.com/coder/coder/v2@v2.34.2
🐹Gogithub.com/coder/coder/v2≥ 2.33.0&&< 2.33.82.33.8go get github.com/coder/coder/v2@v2.33.8
🐹Gogithub.com/coder/coder/v2≥ 2.30.0&&< 2.32.72.32.7go get github.com/coder/coder/v2@v2.32.7
🐹Gogithub.com/coder/coder/v2all versions2.29.17go get github.com/coder/coder/v2@v2.29.17

Affected Products

1 product · 4 configurations
Application
codercoder
≥ 2.34.0 && < 2.34.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/coder/coder/v2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/coder/coder/v2 to 2.34.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7qw2-f75v-62f7 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### 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. Conten
O3 Security · Impact-Aware SCA

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Coder vulnerable to stored HTML injection via workspace…