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TI-2024-18523 Aliases CVE-2024-27918GHSA-7cc2-r658-7xpf

Coder's OIDC authentication allows email with partially matching domain to register

Priority MEDIUM 44CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Coder allows oragnizations to provision remote development environments via Terraform. Prior to versions 2.6.1, 2.7.3, and 2.8.4, a vulnerability in Coder's OIDC authentication could allow an attacker to bypass the `CODER_OIDC_EMAIL_DOMAIN` verification and create an account with an email not in the allowlist. Deployments are only affected if the OIDC provider allows users to create accounts on the provider. During OIDC registration, the user's email was improperly validated against the allowed `CODER_OIDC_EMAIL_DOMAIN`s. This could allow a user with a domain that only partially matched an allowed domain to successfully login or register. An attacker could register a domain name that exploited this vulnerability and register on a Coder instance with a public OIDC provider. Coder instances with OIDC enabled and protected by the `CODER_OIDC_EMAIL_DOMAIN` configuration are affected. Coder instances using a private OIDC provider are not affected, as arbitrary users cannot register through a private OIDC provider without first having an account on the provider. Public OIDC providers are impacted. GitHub authentication and external authentication are not impacted. This vulnerability is remedied in versions 2.8.4, 2.7.3, and 2.6.1 All versions prior to these patches are affected by the vulnerability.*It is recommended that customers upgrade their deployments as soon as possible if they are utilizing OIDC authentication with the `CODER_OIDC_EMAIL_DOMAIN` setting.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00965 61st percentileScored 2026-11-07
Fix Fixed coder (coder): 2.8.4, 2.7.3, 2.6.1github.com/coder/coder/v2 (Go): 2.8.4, 2.7.3, 2.6.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
codercoder2.8.0 to before 2.8.4; 2.7.0 to before 2.7.3; before 2.6.12.8.4, 2.7.3, 2.6.1Patch availableCNA
—github.com/coder/coder/v2 (Go)2.8.0 to before 2.8.42.8.4Patch availableGHSA-7cc2-r658-7xpf
—github.com/coder/coder/v2 (Go)2.7.0 to before 2.7.32.7.3Patch availableGHSA-7cc2-r658-7xpf
—github.com/coder/coder/v2 (Go)before 2.6.12.6.1Patch availableGHSA-7cc2-r658-7xpf
—github.com/coder/coder (Go)up to 0.27.3—No fix listedGHSA-7cc2-r658-7xpf
  • coder Vendorcoder Affected 2.8.0 to before 2.8.4; 2.7.0 to before 2.7.3; before 2.6.1 Fixed in 2.8.4, 2.7.3, 2.6.1 Patch available CNA
  • github.com/coder/coder/v2 (Go) Vendor— Affected 2.8.0 to before 2.8.4 Fixed in 2.8.4 Patch available GHSA-7cc2-r658-7xpf
  • github.com/coder/coder/v2 (Go) Vendor— Affected 2.7.0 to before 2.7.3 Fixed in 2.7.3 Patch available GHSA-7cc2-r658-7xpf
  • github.com/coder/coder/v2 (Go) Vendor— Affected before 2.6.1 Fixed in 2.6.1 Patch available GHSA-7cc2-r658-7xpf
  • github.com/coder/coder (Go) Vendor— Affected up to 0.27.3 Fixed in — No fix listed GHSA-7cc2-r658-7xpf

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*before 2.6.1; 2.7.0 to before 2.7.3; 2.8.0 to before 2.8.4Vulnerablecoder
  • cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:* Versions before 2.6.1; 2.7.0 to before 2.7.3; 2.8.0 to before 2.8.4 Vulnerable ·coder

Remediation

  • Fix · CNA coder (coder) Fixed in 2.8.4, 2.7.3, 2.6.1
  • Fix · GHSA-7cc2-r658-7xpf github.com/coder/coder/v2 (Go) Fixed in 2.8.4 Advisory →
  • Fix · GHSA-7cc2-r658-7xpf github.com/coder/coder/v2 (Go) Fixed in 2.7.3 Advisory →
  • Fix · GHSA-7cc2-r658-7xpf github.com/coder/coder/v2 (Go) Fixed in 2.6.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-27918
  2. 2026-10-03 Alias added: GHSA-7cc2-r658-7xpf

References

Patch 4

Advisory 2

Other 1

  • TI-2026-34071 Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent token theft CVSS 3.1CRITICAL 9.1
  • TI-2026-32394 Coder vulnerable to workspace auto-creation via crafted URL parameters without user consent CVSS 3.1HIGH 8.8
  • TI-2026-39997 Coder's workspace app upsert allows cross-workspace agent rebinding via user-controlled app ID CVSS 3.1HIGH 8.7
  • TI-2026-39996 Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet coordinator CVSS 3.1HIGH 8.2
  • TI-2026-39995 Coder vulnerable to SSH config injection via unsanitized server-supplied values in `coder config-ssh` CVSS 3.1HIGH 8.3
  • TI-2025-36196 Coder's privilege escalation vulnerability could lead to a cross workspace compromise CVSS 3.1HIGH 8.1
See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences