AI agent vulnerability · Other MCP servers and tools

CVE-2026-55435: Suspended Coder users retain access to AI Bridge LLM proxy endpoints

mediumCVSS 3.1 5.4GHSA-wqxv-w64v-5wh6

Summary AI Bridge proxy endpoints authenticate via Server.IsAuthorized in coderd/aibridgedserver, which validates key format, expiry, secret and deleted or system users but does not check whether the account is suspended. Because suspension does not revoke existing API keys, a suspended user's unexpired token keeps working.

Published Jul 6, 2026 · Updated Jul 7, 2026

Affected packages

github.com/coder/coder/v2

Ecosystem: Go
Affected: >= 2.34.0, < 2.34.2
Fixed in: 2.34.2
Check: go list -m github.com/coder/coder/v2

github.com/coder/coder/v2

Ecosystem: Go
Affected: >= 2.33.0, < 2.33.8
Fixed in: 2.33.8
Check: go list -m github.com/coder/coder/v2

github.com/coder/coder/v2

Ecosystem: Go
Affected: >= 2.30.0, < 2.32.7
Fixed in: 2.32.7
Check: go list -m github.com/coder/coder/v2

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Summary

AI Bridge proxy endpoints authenticate via Server.IsAuthorized in coderd/aibridgedserver, which validates key format, expiry, secret and deleted or system users but does not check whether the account is suspended. Because suspension does not revoke existing API keys, a suspended user's unexpired token keeps working.

Note: Practical impact is limited to already-issued API keys of suspended users until those keys are deleted.

Impact

A suspended user with a previously issued long-lived token could continue calling AI Bridge LLM proxy endpoints, consuming paid provider resources billed to the deployment and, if injected MCP tools are enabled, invoking those tools. Access persists until the token expires, which may be months after suspension.

Patches

The fix makes AI Bridge authorization reject non-active users like the standard API key middleware. AI Bridge was introduced in v2.30.0. The v2.29 ESR line is not affected.

The fix is available in the following releases:

| 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) |

Workarounds

On suspension, delete the user's API keys via DELETE /api/v2/users/{user}/keys.

Resources

Fix: #26173

Credits

Coder would like to thank Anthropic's Security Team (ANT-2026-22446) for independently disclosing this issue!

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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