Auth bypass in Runatlantis Atlantis
CVE-2026-82282
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/runatlantis/atlantis/issues/6622 (issue-tracking)
- github.com/runatlantis/atlantis (product)
- github.com/runatlantis/atlantis/blob/12bfa59f44d8f65bfdda132bff61d8f8f29af1d6/s… (technical-description)
- github.com/runatlantis/atlantis/blob/12bfa59f44d8f65bfdda132bff61d8f8f29af1d6/s… (technical-description)
- www.vulncheck.com/advisories/atlantis-github-app-setup-endpoint-returns-app-cre… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82282?
- CVE-2026-82282 is a high-severity vulnerability in Runatlantis Atlantis, classified under Missing Authentication for Critical Function. CVSS score: 8.0/10. Published 2026-08-28.
- How severe is CVE-2026-82282?
- High severity. CVSS v3 base score is 8.0 out of 10.