CVE-2026-55430
Coder's subdomain workspace app routing trusts unauthenticated X-Forwarded-Host header, enabling cross-app data access in github.com/coder/coder
5.8
MEDIUM
CVSS 3.1
EPSS 0.21%
Description
Coder's subdomain workspace app routing trusts unauthenticated X-Forwarded-Host header, enabling cross-app data access in github.com/coder/coder
How to fix CVE-2026-55430
To remediate CVE-2026-55430, upgrade the affected package to a fixed version below.
- —no fix listed
- —upgrade to 2.34.2 or later
- —upgrade to 2.29.17 or later
Is CVE-2026-55430 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0
- >= 2.34.0, < 2.34.2
- from 0, < 2.29.17, >= 2.30.0, < 2.32.7, >= 2.33.0, < 2.33.8, >= 2.34.0, < 2.34.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.8 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N |