CVE-2026-18676
Kong Mesh: default control plane config leaks the admin token cross-origin via a CORS wildcard and localhost admin
Description
The default kuma-cp configuration in Kong Mesh reveals the admin bootstrap token and signing keys to any webpage the operator visits while the control plane is reachable from their browser. Due to a CORS misconfiguration a cross-origin fetch() from a malicious page returns the admin JWT and signing material.
INFO
Published Date :
Aug. 12, 2026, 7:17 p.m.
Last Modified :
Aug. 12, 2026, 7:17 p.m.
Remotely Exploit :
Yes !
Source :
02762ae7-200e-4b20-9b2b-a77d5b8fc4cb
Affected Products
The following products are affected by CVE-2026-18676
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | 02762ae7-200e-4b20-9b2b-a77d5b8fc4cb | ||||
| CVSS 4.0 | MEDIUM | 02762ae7-200e-4b20-9b2b-a77d5b8fc4cb |
Solution
- Restrict CORS policy for the control plane.
- Remove default token and signing keys.
- Update kuma-cp configuration securely.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-18676.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-18676 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-18676
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-18676 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-18676 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 02762ae7-200e-4b20-9b2b-a77d5b8fc4cb
Aug. 12, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Kong Inc.', 'modules': ['kuma-cp'], 'product': 'Kong Mesh', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.7.25', 'versionType': 'semver'}, {'status': 'affected', 'version': '2.8.0', 'lessThan': '2.9.15', 'versionType': 'semver'}, {'status': 'affected', 'version': '2.10.0', 'lessThan': '2.11.13', 'versionType': 'semver'}, {'status': 'affected', 'version': '2.12.0', 'lessThan': '2.12.10', 'versionType': 'semver'}, {'status': 'affected', 'version': '2.13.0', 'lessThan': '2.13.5', 'versionType': 'semver'}], 'platforms': ['Linux'], 'defaultStatus': 'unaffected'}] Added Description The default kuma-cp configuration in Kong Mesh reveals the admin bootstrap token and signing keys to any webpage the operator visits while the control plane is reachable from their browser. Due to a CORS misconfiguration a cross-origin fetch() from a malicious page returns the admin JWT and signing material. Added CVSS V4.0 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 Added CWE CWE-346 Added CWE CWE-942 Added Reference https://developer.konghq.com/mesh/changelog/ Added Reference https://github.com/kumahq/kuma/pull/16416 Added Reference https://github.com/kumahq/kuma/pull/16423 Added Reference https://github.com/kumahq/kuma/pull/16424 Added Reference https://github.com/kumahq/kuma/pull/16425 Added Reference https://github.com/kumahq/kuma/pull/16426 Added Reference https://github.com/kumahq/kuma/pull/16427 Added Reference https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2