CVE-2026-55432 PUBLISHED

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

Assigner: GitHub_M
Reserved: 16.06.2026 Published: 08.07.2026 Updated: 08.07.2026

Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, 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. Exploitation requires the ability to register sub-agent apps in a workspace the attacker controls. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2clamps the sub-agent app sharing level to the template's MaxPortSharingLevel. As a workaround, disable wildcard app hostnames (CODER_WILDCARD_ACCESS_URL) to block subdomain-based app routing.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS Score: 5.4

Product Status

Vendor coder
Product coder
Versions
  • Version >= 2.34.0, < 2.34.2 is affected
  • Version >= 2.33.0, < 2.33.8 is affected
  • Version >= 2.30.0, < 2.32.7 is affected
  • Version < 2.29.17 is affected

References

Problem Types

  • CWE-862: Missing Authorization CWE