> CVE-2026-45021 [MEDIUM]

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PUBLISHED
2026-05-28 18:16
MODIFIED
2026-05-28 18:56
CVSS_SCORE V3
5.1
EPSS (Prob. Exploit)
0.20%
Top 89.6%
DATA SOURCES:
NVD đź”— 2026-05-28 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-01 GITHUB đź”— 2026-11-05 OSV đź”— 2026-10-26

> DESCRIPTION

Kuma is a modern Envoy-based service mesh that can run on every cloud across both Kubernetes and VMs. Prior to 2.7.25, 2.9.15, 2.11.13, 2.12.10, and 2.13.5, the default kuma-cp config leaks the admin bootstrap token and signing keys to any webpage the operator visits while the control plane is reachable from their browser. CorsAllowedDomains: [".*"] reflects any Origin, and LocalhostIsAdmin: true promotes requests from 127.0.0.1 to mesh-system:admin. A cross-origin fetch() from a malicious page returns the admin JWT and signing material. This vulnerability is fixed in 2.7.25, 2.9.15, 2.11.13, 2.12.10, and 2.13.5.

> AFFECTED_PRODUCTS

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

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
Required (R)
Nécessite une action utilisateur (clic lien, ouverture fichier, etc.)
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
Low (L)
Divulgation limitée d'informations
I (Impact Intégrité)
Integrity Impact
Low (L)
Modification limitée des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

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

> WEAKNESSES

CWE-346 CWE-942

> CWE DETAILED DESCRIPTIONS

CWE-346: Origin Validation Error - The product does not properly verify that the source of data or communication is valid. | CWE-942: Permissive Cross-domain Security Policy with Untrusted Domains - The product uses a web-client protection mechanism such as a Content Security Policy (CSP) or cross-domain policy file, but the policy includes untrusted domains with which the web client is allowed to communicate.

> GITHUB SECURITY ADVISORY

GHSA-3vcp-chfh-f6r2 MODERATE

Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin

AFFECTED PACKAGES:
GO / github.com/kumahq/kuma
>= 2.13.0, < 2.13.5
Fixed in: 2.13.5
GO / github.com/kumahq/kuma
>= 2.12.0, < 2.12.10
Fixed in: 2.12.10
GO / github.com/kumahq/kuma
>= 2.11.0, < 2.11.13
Fixed in: 2.11.13
GO / github.com/kumahq/kuma
>= 2.9.0, < 2.9.15
Fixed in: 2.9.15
GO / github.com/kumahq/kuma
< 2.7.25
Fixed in: 2.7.25

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin

AFFECTED PACKAGES:
Unknown / Unknown
103 versions affected
ALIASES:
CVE-2026-18676, GHSA-3vcp-chfh-f6r2, GO-2026-5102

> HISTORIQUE DES MODIFICATIONS

Première apparition
28/05/2026 18:16
Source: NVD
📊 ENRICHISSEMENT 01/06/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-346: Origin Validation Error - The product does not properly verify that the source of data or communication is valid. | CWE-942: Permissive Cross-domain Security Policy with Untrusted Domains - T...
Total des modifications: 1 Dernière mise à jour: 5 months ago

> REFERENCES

https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907
https://github.com/kumahq/kuma/pull/16416
https://github.com/kumahq/kuma/pull/16423
https://github.com/kumahq/kuma/pull/16424
https://github.com/kumahq/kuma/pull/16425
https://github.com/kumahq/kuma/pull/16426
https://github.com/kumahq/kuma/pull/16427
https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2
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