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Vulnerability record · CVE-2026-82282 · published 28 August 2026

CVE-2026-82282: Missing authentication for critical function vulnerability

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.

8.8 CVSS 4.0 High EPSS 0.44% · top 64.4% CWE-306 · Missing authentication for critical function Deferred
8.8CVSS 4.0 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
24 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/runatlantis/atlantis
https://github.com/runatlantis/atlantis/blob/12bfa59f44d8f65bfdda132bff61d8f8f29af1d6/server/controllers/github_app_cont
https://github.com/runatlantis/atlantis/blob/12bfa59f44d8f65bfdda132bff61d8f8f29af1d6/server/middleware.go
https://github.com/runatlantis/atlantis/issues/6622
https://www.vulncheck.com/advisories/atlantis-github-app-setup-endpoint-returns-app-credentials-to-unauthenticated-calle

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Source: NIST National Vulnerability Database (record CVE-2026-82282), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.