GHSA-jf75-p25m-pw74 — high GitHub Advisory (CVE-2025-66411) in go/github.com/coder/coder/v2

Description

Summary

Workspace Agent manifests containing sensitive values were logged in plaintext unsanitized

Details

By default Workspace Agent logs are redirected to stderr
https://github.com/coder/coder/blob/a8862be546f347c59201e2219d917e28121c0edb/cli/agent.go#L432-L439

Workspace Agent Manifests containing sensitive environment variables were logged insecurely
https://github.com/coder/coder/blob/7beb95fd56d2f790502e236b64906f8eefb969bd/agent/agent.go#L1090

An attacker with limited local access to the Coder Workspace (VM, K8s Pod etc.) or a third-party system (SIEM, logging stack) could access those logs

This behavior opened room for unauthorized access and privilege escalation

Impact

Impact varies depending on the environment variables set in a given workspace

Patches

Fix was released & backported:
- https://github.com/coder/coder/releases/tag/v2.28.4
- https://github.com/coder/coder/releases/tag/v2.27.7
- https://github.com/coder/coder/releases/tag/v2.26.5

Workarounds

One potential workaround is to disable Workspace Agent Logs by setting following configuration option
CODER_AGENT_LOGGING_HUMAN=/dev/null
> platform operators are advised to upgrade their deployments

Basic information

Type: reviewed
Severity: high
Advisory on GitHub: Open advisory ↗
Repository advisory: Open repository advisory ↗
Source code: Browse source ↗
Published (advisory): 2025-12-03 16:28:36 UTC
Updated: 2025-12-04 16:22:50 UTC
GitHub reviewed: 2025-12-03 16:28:36 UTC
NVD published: 2025-12-03

Score	Percentile
0.04%	11.48%

CVSS Scores

Base score	Version	Severity	Vector
7.8	3.1	—	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type	Value
GHSA	GHSA-jf75-p25m-pw74 ↗
CVE	CVE-2025-66411 ↗

CWEs

CWE id	Name
CWE-532	Insertion of Sensitive Information into Log File

Affected packages (3)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem	Package	Vulnerable range	First patched	Vulnerable functions
go	github.com/coder/coder/v2	< 2.26.5	2.26.5	—
go	github.com/coder/coder/v2	>= 2.27.0, < 2.27.7	2.27.7	—
go	github.com/coder/coder/v2	>= 2.28.0, < 2.28.4	2.28.4	—

Coder logs sensitive objects unsanitized