GHSA-29xf-69gq-m9jx CVE-2026-55077 GO-2026-5906

Coder: User-admin role can reset owner account password

High Go

Severity: 7.2 / 10; High · CVSS 3.1
Exploit chance (EPSS): 0.61%; Chance of exploitation in the next 30 days. Higher than 49.46% of scored vulnerabilities.
Known exploited: No; Not in CISA's catalog
Weakness: CWE-285 Improper Authorization
Fix: 2.34.2; Upgrade github.com/coder/coder/v2 to this version or later

Description

Summary

The PUT /api/v2/users/{user}/password endpoint authorized only ActionUpdatePersonal and did not prevent a user-admin from resetting an owner account's password. It also did not require the current password when an admin reset another user's password.

Note: Exploitation requires the privileged user-admin role so practical risk is limited to deployments that grant user-admin to less trusted operators.

Impact

A user-admin could reset any owner's password without knowing it, authenticate as that owner and gain full deployment control, including templates, workspaces, licensing, organization settings and the ability to self-assign the owner role. This was a privilege escalation from user-admin to owner.

Patches

The fix prevents non-owner users from resetting the password of an account that holds the owner role.

The fix was backported to all supported release lines:

Release line	Patched version
2.34	v2.34.2
2.33	v2.33.8
2.32	v2.32.7
2.29 (ESR)	v2.29.17

Workarounds

Restrict the user-admin role to trusted administrators until upgrading.

Resources

Fix: #25709

Credits

Coder would like to thank Anthropic's Security Team (ANT-2026-22436) for independently disclosing this issue!

Affected versions

Go

Package	Vulnerable	Fixed in
github.com/coder/coder	`all versions`	No fix yet
github.com/coder/coder/v2	`>= 2.34.0, < 2.34.2`	`2.34.2`
github.com/coder/coder/v2	`>= 2.33.0, < 2.33.8`	`2.33.8`
github.com/coder/coder/v2	`>= 2.30.0, < 2.32.7`	`2.32.7`
github.com/coder/coder/v2	`< 2.29.17`	`2.29.17`
github.com/coder/coder/v2	`< 2.29.17` `>= 2.30.0, < 2.32.7` `>= 2.33.0, < 2.33.8` `>= 2.34.0, < 2.34.2`	`2.29.17` `2.32.7` `2.33.8` `2.34.2`

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

github.com/coder/coder/v2 Go → `2.34.2`

go

go get github.com/coder/coder/v2@v2.34.2 && go mod tidy

Severity breakdown

CVSS 3.1 7.2

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: High
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Weakness

CWE-285: Improper Authorization

The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

How to prevent it

Architecture and Design: Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) to enforce the roles at the appropriate boundaries. Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
Architecture and Design: Ensure that you perform access control checks related to your business logic. These checks may be different than the access control checks that you apply to more generic resources such as files, connections, processes, memory, and database records. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor.
Architecture and Design: Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using authorization frameworks such as the JAAS Authorization Framework [REF-233] and the OWASP ESAPI Access Control feature [REF-45].
Architecture and Design: For web applications, make sure that the access control mechanism is enforced correctly at the server side on every page. Users should not be able to access any unauthorized functionality or information by simply requesting direct access to that page. One way to do this is to ensure that all pages containing sensitive information are not cached, and that all such pages restrict access to requests that are accompanied by an active and authenticated session token associated with a user who has the required permissions to access that page.
System Configuration, Installation: Use the access control capabilities of your operating system and server environment and define your access control lists accordingly. Use a "default deny" policy when defining these ACLs.

References

Packages

github.com/coder/coder

Timeline

Jul 6, 2026 Published
Jul 9, 2026 Last updated by the source
Nov 1, 2026 Latest EPSS score

Advisory	Severity	Why it's related
GHSA-h58c-xccx-75m3 Coder: Stored HTML injection via unescaped ApplicationName and LogoURL appearance settings	Medium	Also affects github.com/coder/coder
GHSA-8fxq-53rx-ph5f Coder: Login endpoint user enumeration via timing-defense placeholder in password comparison	Medium	Also affects github.com/coder/coder
GHSA-qrwj-vh9x-gw5v Coder's workspace agent API insecure redirect handling allowed cross-agent file read and write	High	Also affects github.com/coder/coder
GHSA-5wg6-jmq2-53pw Coder's workspace app CORS origin check can be bypassed via UUID-based subdomain spoofing	Medium	Also affects github.com/coder/coder
GHSA-7qw2-f75v-62f7 Coder vulnerable to stored HTML injection via workspace agent logs in AgentLogLine component	Medium	Also affects github.com/coder/coder
GHSA-84rm-42xw-mx52 Coder's AI Bridge Proxy skips TLS certificate verification in default configuration	High	Also affects github.com/coder/coder
GHSA-wqxv-w64v-5wh6 Suspended Coder users retain access to AI Bridge LLM proxy endpoints	Medium	Also affects github.com/coder/coder
GHSA-f5vp-w269-392g Coder vulnerable to denial of service via unbounded request body in AI Bridge provider endpoints	Medium	Also affects github.com/coder/coder

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