> CVE-2026-55431 [HIGH]

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PUBLISHED
2026-07-08 01:16
MODIFIED
2026-07-08 01:16
CVSS_SCORE V3
7.7
EPSS (Prob. Exploit)
0.34%
Top 72.9%
DATA SOURCES:
NVD 🔗 2026-07-08 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-01 GITHUB 🔗 2026-11-05 OSV 🔗 2026-11-02

> 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, `coder open app` opens external workspace-app URLs without validating the scheme or host. When an external app URL contains the `$SESSION_TOKEN` placeholder the CLI replaces it with the user's real session token before handing the URL to the OS open handler. Practical exploitation requires the victim to run `coder open app` against a workspace whose external app definition the attacker controls. Only a malicious template author can control external app URLs. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 applies a URL-scheme allowlist in the CLI and limits `$SESSION_TOKEN` substitution to trusted destinations like the web frontend. As a workaround, avoid running `coder open app` for untrusted workspaces.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
EXPLOITABILITY
1.3
IMPACT
5.8

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
High (H)
Conditions spécifiques doivent être réunies pour exploiter
PR (Privilèges Requis)
Privileges Required
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
Required (R)
Nécessite une action utilisateur (clic lien, ouverture fichier, etc.)
S (Périmètre)
Scope
Changed (C)
Impact s'étend au-delà du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-522 CWE-601

> CWE DETAILED DESCRIPTIONS

CWE-522: Insufficiently Protected Credentials - The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval. | CWE-601: URL Redirection to Untrusted Site - The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

> GITHUB SECURITY ADVISORY

GHSA-v54h-cp2w-9x4g HIGH

Coder's session token leaked to arbitrary hosts via `coder open app` for external workspace apps

AFFECTED PACKAGES:
GO / github.com/coder/coder/v2
< 2.29.17
Fixed in: 2.29.17
GO / github.com/coder/coder/v2
>= 2.30.0, < 2.32.7
Fixed in: 2.32.7
GO / github.com/coder/coder/v2
>= 2.33.0, < 2.33.8
Fixed in: 2.33.8
GO / github.com/coder/coder/v2
>= 2.34.0, < 2.34.2
Fixed in: 2.34.2

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Coder's session token leaked to arbitrary hosts via `coder open app` for external workspace apps

AFFECTED PACKAGES:
Unknown / Unknown
192 versions affected
ALIASES:
GHSA-v54h-cp2w-9x4g, GO-2026-5924

> HISTORIQUE DES MODIFICATIONS

Première apparition
08/07/2026 01:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-522: Insufficiently Protected Credentials - The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retri...
Nouvelle valeur:
CWE-522: Insufficiently Protected Credentials - The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retri...
📊 ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-522: Insufficiently Protected Credentials - The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retri...
Total des modifications: 2 Dernière mise à jour: 5 days ago

> REFERENCES

https://github.com/coder/coder/pull/26146
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
https://github.com/coder/coder/security/advisories/GHSA-v54h-cp2w-9x4g
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