Vulnerability · Published Aug 28, 2026 · Assigned by VulnCheck
CVE-2026-82282Atlantis GitHub App Setup Endpoint Returns App Credentials to Unauthenticated Callers
High 8.0
In plain English
A high-severity missing authentication in atlantis from runatlantis. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).
Severity (CVSS 3.1)8.0High
Exploit odds (30 days)0.4%top 61.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| runatlantis | atlantis | 0 – through 0.47.1 |
Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
References
- GitHub Issue #6622 issue-tracking
- https://github.com/runatlantis/atlantis product
- Vulnerable code: github_app_controller.go technical-description
- Vulnerable code: middleware.go technical-description
- VulnCheck Advisory: Atlantis GitHub App Setup Endpoint Returns App Credentials to Unauthenticated Callers third-party-advisory