CVE-2026-42283: CWE-306: Missing Authentication for Critical Function in devspace-sh devspace
DevSpace versions prior to 6.3.21 have a vulnerability where the UI server WebSocket accepts connections from all origins by default. This allows a malicious website visited by a developer to establish a cross-origin WebSocket connection to ws://127.0.0.1:8090, exposing several endpoints without proper authentication. The issue is fixed in version 6.3.21.
AI Analysis
Technical Summary
DevSpace, a client-only developer tool for Kubernetes, had a vulnerability (CVE-2026-42283) in versions before 6.3.21 where its UI server WebSocket accepted connections from any origin. This lack of origin restriction allowed malicious websites to connect cross-origin to the local WebSocket server at ws://127.0.0.1:8090, exposing multiple endpoints without authentication. This is a case of CWE-306 (Missing Authentication for Critical Function) combined with CWE-200 (Information Exposure). The vulnerability is fixed in version 6.3.21.
Potential Impact
An attacker can exploit this vulnerability by tricking a developer into visiting a malicious website while running the DevSpace UI. The malicious site can then establish a WebSocket connection to the local DevSpace UI server, potentially accessing sensitive endpoints and data. The CVSS score of 7.7 reflects high impact on confidentiality, integrity, and availability. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
Upgrade DevSpace to version 6.3.21 or later, where this vulnerability is fixed. Since the vendor has released a fixed version, applying this official update is the recommended remediation. No other mitigation steps are indicated by the vendor advisory.
CVE-2026-42283: CWE-306: Missing Authentication for Critical Function in devspace-sh devspace
Description
DevSpace versions prior to 6.3.21 have a vulnerability where the UI server WebSocket accepts connections from all origins by default. This allows a malicious website visited by a developer to establish a cross-origin WebSocket connection to ws://127.0.0.1:8090, exposing several endpoints without proper authentication. The issue is fixed in version 6.3.21.
CVSS v3.1
Score 7.7high
Affected software
pkg:github/devspace-sh/devspaceRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
DevSpace, a client-only developer tool for Kubernetes, had a vulnerability (CVE-2026-42283) in versions before 6.3.21 where its UI server WebSocket accepted connections from any origin. This lack of origin restriction allowed malicious websites to connect cross-origin to the local WebSocket server at ws://127.0.0.1:8090, exposing multiple endpoints without authentication. This is a case of CWE-306 (Missing Authentication for Critical Function) combined with CWE-200 (Information Exposure). The vulnerability is fixed in version 6.3.21.
Potential Impact
An attacker can exploit this vulnerability by tricking a developer into visiting a malicious website while running the DevSpace UI. The malicious site can then establish a WebSocket connection to the local DevSpace UI server, potentially accessing sensitive endpoints and data. The CVSS score of 7.7 reflects high impact on confidentiality, integrity, and availability. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
Upgrade DevSpace to version 6.3.21 or later, where this vulnerability is fixed. Since the vendor has released a fixed version, applying this official update is the recommended remediation. No other mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-26T12:13:55.551Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a05f312ec166c07b0f45c99
Added to database: 05/14/2026, 16:06:42 UTC
Last enriched: 05/22/2026, 15:31:57 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 94
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