CVE-2026-55075Network attack vector

Account takeover via unsafe OIDC email linking

Published Jul 7, 2026 · Updated Jul 7, 2026

Authentication bypass in affected Coder 2.x releases allows remote attackers to take over accounts through malicious OIDC identities. Email fallback links an existing account by address without rejecting a different IdP subject, while the claim parser treats an absent or non-boolean email_verified value as verified. Exploitation requires OIDC access with the victim’s email and an account not already linked to another IdP subject; success grants access to the victim’s workspaces, templates, and resources.

CVSS severity7.4
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in affected Coder 2.x releases allows remote attackers to take over accounts through malicious OIDC identities. Email fallback links an existing account by address without rejecting a different IdP subject, while the claim parser treats an absent or non-boolean email_verified value as verified. Exploitation requires OIDC access with the victim’s email and an account not already linked to another IdP subject; success grants access to the victim’s workspaces, templates, and resources.

The record

CVE
CVE-2026-55075
Published
Jul 7, 2026
Updated
Jul 7, 2026
Vendor
Coder
Product
Coder
Classifications
CWE-287, CWE-289, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.29.17
  2. Affected versionversion=>= 2.30.0, < 2.32.7
  3. Affected versionversion=>= 2.33.0, < 2.33.8
  4. Affected versionversion=>= 2.34.0, < 2.34.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Coder · Coderversion=< 2.29.17; version=>= 2.30.0, < 2.32.7; version=>= 2.33.0, < 2.33.8; version=>= 2.34.0, < 2.34.2

Published CVSS scores

7.4GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-289Authentication Bypass by Alternate Name
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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