# CVE-2026-55076: Coder account takeover via OIDC email verification bypass

Source: https://junglewise.ai/threats/cve-2026-55076-coder-account-takeover-via-oidc-email-verification-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-07. Updated: 2026-07-07  
License: CC BY 4.0 with a link back

CVE-2026-55076 · Severity: high · CVSS 7.4 · Published 2026-07-07

Coder, a platform for managing remote development environments, contained a flaw in how it verified user identities during login. An attacker could potentially take over a victim's account by exploiting a weakness in how the system confirms email addresses from third-party identity providers. This could lead to unauthorized access to sensitive development environments and corporate data.

Technologies: [Coder](https://junglewise.ai/threats/technologies/coder), [github.com/coder/coder (Go)](https://junglewise.ai/threats/technologies/github-com-coder-coder), [github.com/coder/coder/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-coder-coder-v2). Vendors: [Coder](https://junglewise.ai/threats/vendors/coder), [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-55076 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-55076 being exploited in the wild.

**How severe is CVE-2026-55076?** High severity, with a CVSS score of 7.4, published 7 July 2026.

**Which products and versions are affected?** Coder < 2.29.17, >= 2.30.0 < 2.32.7, >= 2.33.0 < 2.33.8, >= 2.34.0 < 2.34.2; github.com/coder/coder (Go) SEMVER:introduced=0; github.com/coder/coder/v2 (Go) SEMVER:introduced=0,fixed=2.29.17,introduced=2.30.0,fixed=2.32.7,introduced=2.33.0,fixed=2.33.8,introduced=2.34.0,fixed=2.34.2, SEMVER:introduced=2.34.0,fixed=2.34.2.

**Is there a fix for CVE-2026-55076?** Yes. github.com/coder/coder/v2 (Go): upgrade to 2.34.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-55076 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-55076?** Check whether you run Coder, github.com/coder/coder (Go) or github.com/coder/coder/v2 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/coder/coder/v2 (Go): upgrade to 2.34.2 or later

  ```sh
  go get github.com/coder/coder/v2@v2.34.2
  ```


## Technical details

A vulnerability exists in Coder's OIDC implementation due to improper type assertion and insecure account linking logic. The OIDC callback used a Go type assertion for the 'email_verified' claim that failed open if the Identity Provider (IdP) returned a non-boolean value (like a string) or omitted the claim entirely. When combined with an unconditional email-based account fallback that matched users by email rather than a unique IdP subject, an attacker could register a victim's email at a malicious or misconfigured IdP to gain access to the victim's Coder account. The fix implements strict type coercion for the verification claim and restricts email-based fallback to first-time account linking only.

## Affected products

- Coder Coder < 2.29.17, >= 2.30.0 < 2.32.7, >= 2.33.0 < 2.33.8, >= 2.34.0 < 2.34.2

## Identifiers

- CVE-2026-55076
- GHSA-75vm-6w67-gwvp
- GO-2026-5907

## Timeline

- 2026-05-27: other: Fixes submitted via pull requests
- 2026-06-12: patched: Security release v2.29.17 published
- 2026-07-07: disclosed: CVE published

## References

- [https://github.com/coder/coder/pull/25712](https://github.com/coder/coder/pull/25712)
- [https://github.com/coder/coder/pull/25713](https://github.com/coder/coder/pull/25713)
- [https://github.com/coder/coder/releases/tag/v2.29.17](https://github.com/coder/coder/releases/tag/v2.29.17)
- [https://github.com/coder/coder/releases/tag/v2.32.7](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/v2.33.8)
- [https://github.com/coder/coder/releases/tag/v2.34.2](https://github.com/coder/coder/releases/tag/v2.34.2)
- [https://github.com/coder/coder/security/advisories/GHSA-75vm-6w67-gwvp](https://github.com/coder/coder/security/advisories/GHSA-75vm-6w67-gwvp)

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