Vulnerability · Published Jul 8, 2026 · Assigned by GitHub_M

CVE-2026-55432Coder's sub-agent app registration bypasses template port-sharing policy enforcement

Medium 5.4

In plain English

A medium-severity missing authorization in coder from coder. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 75.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/coder/coder	no fix listed	GO-2026-5926
Go	github.com/coder/coder/v2	2.29.17, 2.32.7, 2.33.8, 2.34.2	GO-2026-5926
Go	github.com/coder/coder/v2	2.34.2	GHSA-x9qq-2qh5-8rxf
Go	github.com/coder/coder/v2	2.33.8	GHSA-x9qq-2qh5-8rxf
Go	github.com/coder/coder/v2	2.32.7	GHSA-x9qq-2qh5-8rxf
Go	github.com/coder/coder/v2	2.29.17	GHSA-x9qq-2qh5-8rxf

Affected products (as reported)

Vendor	Product	Versions
coder	coder	>= 2.34.0, < 2.34.2>= 2.33.0, < 2.33.8>= 2.30.0, < 2.32.7< 2.29.17

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

https://github.com/coder/coder/security/advisories/GHSA-x9qq-2qh5-8rxf x_refsource_CONFIRM
https://github.com/coder/coder/pull/26061 x_refsource_MISC
https://github.com/coder/coder/releases/tag/v2.29.17 x_refsource_MISC
https://github.com/coder/coder/releases/tag/v2.32.7 x_refsource_MISC
https://github.com/coder/coder/releases/tag/v2.33.8 x_refsource_MISC
https://github.com/coder/coder/releases/tag/v2.34.2 x_refsource_MISC