🛡️ CVE-2026-55432 — coder

🟡 CVSS 5.4 — Medium ✅ No Known Exploit CWE-862 NVD
5.4
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Coder's sub-agent app registration bypasses template port-sharing policy enforcement

Summary

The CreateSubAgent RPC did not validate a requested app sharing level against the template's MaxPortSharingLevel before persisting workspace apps, letting a workspace owner exceed the administrator's configured maximum.

> Note: Exploitation requires the ability to register sub-agent apps in a workspace the attacker controls.

Impact

A workspace owner with an agent token could register a sub-agent app as PUBLIC even when the template's MaxPortSharingLevel was owner, exposing the app to unauthenticated users via the wildcard app domain. This affected only deployments using Enterprise port-sharing policy and wildcard app hostnames and required an authenticated workspace owner with an agent token.

Patches

The fix clamps the sub-agent app sharing level to the template's MaxPortSharingLevel.

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

Disable wildcard app hostnames (CODER_WILDCARD_ACCESS_URL) to block subdomain-based app routing.

Resources

  • Fix: #26061

Credits

Coder would like to thank Anthropic's Security Team (ANT-2026-22452) for independently disclosing this issue!

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

Weakness class

CVE-2026-55432 is classified as CWE-862: Missing Authorization. No authorisation check is performed before carrying out a restricted action.

Affected software

CVE-2026-55432 is recorded against 3 packages.

  • coder (from 2.34.0 up to 2.34.2)
  • github.com/coder/coder
  • github.com/coder/coder/v2

Timeline and source

Published on 8 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
github.com
github.com
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Details

Severity MEDIUM
CVSS Score 5.4
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE CWE-862
Public Exploit ✅ No
Source NVD
Published 2026-07-08
Updated 2026-08-12
Modified 2026-07-08

Affected Packages

Software From version Fixed in
coder 2.34.0 2.34.2
github.com/coder/coder — —
github.com/coder/coder/v2 — —

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