Open-Source Security Intelligence

Know every vulnerability
before it knows you.

DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.

Check if your repositories are affected!View on GitHub
Search

GHSA-h58c-xccx-75m3

LowCVSS 3.4 / 10
Published Aug 20, 2026·Last modified Aug 20, 2026
Affected Components(4)
Go logogithub.com/coder/coder/v2
2.33.0 – 2.33.8
Go logogithub.com/coder/coder/v2
2.30.0 – 2.32.7
Go logogithub.com/coder/coder/v2
2.34.0 – 2.34.2
1 / 2
Description

Summary

The ApplicationName and LogoURL appearance settings were rendered into HTML output without sufficient escaping which let a highly privileged Owner-role user inject HTML into the Coder dashboard and SMTP notification emails.

Note: Exploitation requires the Owner role which already holds full administrative control of the deployment so practical impact is limited.

Impact

An Owner-role user could store HTML markup in the ApplicationName or LogoURL appearance settings that later rendered in the dashboard and in SMTP notification emails which results in stored HTML injection against other users of the deployment. Exploitation requires the highly privileged Owner role.

Patches

The fix escapes the ApplicationName and LogoURL appearance values in HTML output before rendering.

The fix was backported to all supported release lines:

| Release line | Patched version | |---|---| | 2.34 | v2.34.2 | | 2.33 | v2.33.8 | | 2.32 | v2.32.7 | | 2.29 (ESR) | v2.29.17 |

Workarounds

Restrict the Owner role to trusted administrators.

References

  • Fix: #25804

Credits

We'd like to thank Anthropic's Security Team (ANT-2026-22453) for independently disclosing this issue!

Upload your SBOM

Upload your own SBOM in CycloneDX 1.6 or higher (JSON) directly here to check your vulnerabilities.

Risk Scores
Base Score
3.4

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the integrity of the data.

Threat Intelligence
3.1

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Browse More

Low severity
Scan your project

Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.

Checkout DevGuard