Coder vulnerable to OIDC account takeover via email-based user matching and email_verified bypass

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Summary

CVECVE-2026-55075
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-07 22:16:53 UTC
Updated2026-07-08 19:46:56 UTC
DescriptionCoder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, two flaws in Coder's OIDC login chained into account takeover. Email-based user matching fell back to linking by email without checking for an existing link to a different IdP subject and the `email_verified` claim was only enforced when present as a boolean `false` so an absent or non-boolean claim was treated as verified. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 restricts the email fallback to first-time and legacy linking and defaults `email_verified` to false when the claim is absent or of an unexpected type. As a workaround, configure the OIDC provider to disallow self-registration or to require email verification before issuing tokens.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.004790000 probability, percentile 0.379560000 (date 2026-07-09)

Problem Types: CWE-287 | CWE-289 | CWE-287 CWE-287: Improper Authentication | CWE-289 CWE-289: Authentication Bypass by Alternate Name

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Coder Coder All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Coder Coder affected >= 2.34.0, < 2.34.2 Not specified
CNA Coder Coder affected >= 2.33.0, < 2.33.8 Not specified
CNA Coder Coder affected >= 2.30.0, < 2.32.7 Not specified
CNA Coder Coder affected < 2.29.17 Not specified

References

ReferenceSourceLinkTags
github.com/coder/coder/releases/tag/v2.34.2 [email protected] github.com Release Notes
github.com/coder/coder/releases/tag/v2.29.17 [email protected] github.com Release Notes
github.com/coder/coder/pull/25712 [email protected] github.com Issue Tracking, Patch
github.com/coder/coder/releases/tag/v2.32.7 [email protected] github.com Release Notes
github.com/coder/coder/releases/tag/v2.33.8 [email protected] github.com Release Notes
github.com/coder/coder/security/advisories/GHSA-9r87-mvcw-x35f [email protected] github.com Patch, Vendor Advisory
github.com/coder/coder/pull/25713 [email protected] github.com Issue Tracking, Patch
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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