CVE-2026-82282
Atlantis GitHub App Setup Endpoint Returns App Credentials to Unauthenticated Callers
- State
- Published
- Severity
- 8.8 High
- Published
- Aug 28, 2026
- Updated
- Sep 24, 2026
- Reserved
- Aug 28, 2026
Description
Atlantis through 0.47.1 fails to authenticate the /github-app/setup endpoint, allowing unauthenticated attackers to access GitHub App credentials. Attackers can observe or intercept the GitHub redirect during setup to obtain the RSA private key and webhook secret, enabling installation token minting and webhook payload forgery.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.8 High | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N | VulnCheck |
| 3.1 | 8.0 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
atlantisrunatlantis |
|
References
- GitHub Issue #6622issue-tracking
- https://github.com/runatlantis/atlantisproduct
- Vulnerable code: github_app_controller.gotechnical-description
- Vulnerable code: middleware.gotechnical-description
- VulnCheck Advisory: Atlantis GitHub App Setup Endpoint Returns App Credentials to Unauthenticated Callersthird-party-advisory
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