Answer in brief
CVE-2026-18676 records a Medium severity (CVSS 5.1) vulnerability in Kong Mesh: default control plane config leaks the admin token cross-origin via a CORS wildcard and localhost admin. The current sources do not mark it as known exploited. The current feed maps Kong Inc./Kong Mesh (generic), github.com/kumahq/kuma (go), github.com/kumahq/kuma (go), github.com/kumahq/kuma (go) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Kong Inc./Kong Mesh (generic), github.com/kumahq/kuma (go), github.com/kumahq/kuma (go), github.com/kumahq/kuma (go) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Kong Inc./Kong Meshgeneric | >=0 <2.7.25 || >=2.8.0 <2.9.15 || >=2.10.0 <2.11.13 || >=2.12.0 <2.12.10 || >=2.13.0 <2.13.5 | 2.7.25, 2.9.15, 2.11.13, 2.12.10, 2.13.5 |
| github.com/kumahq/kumago | <2.7.25 | 2.7.25 |
| github.com/kumahq/kumago | >=2.9.0,<2.9.15 | 2.9.15 |
| github.com/kumahq/kumago | >=2.11.0,<2.11.13 | 2.11.13 |
| github.com/kumahq/kumago | >=2.12.0,<2.12.10 | 2.12.10 |
| github.com/kumahq/kumago | >=2.13.0,<2.13.5 | 2.13.5 |
| github.com/kumahq/kumago | >=0 | Not reported |
| github.com/kumahq/kumago | >=0 <2.7.25 | 2.7.25 |
| github.com/kumahq/kumago | >=2.9.0 <2.9.15 | 2.9.15 |
| github.com/kumahq/kumago | >=2.11.0 <2.11.13 | 2.11.13 |
| github.com/kumahq/kumago | >=2.12.0 <2.12.10 | 2.12.10 |
| github.com/kumahq/kumago | >=2.13.0 <2.13.5 | 2.13.5 |
| github.com/kumahq/kuma/v2go | >=0 <2.7.25 >=2.9.13 <2.11.13 >=2.12.4 <2.12.10 >=2.13.0 <2.13.5 | 2.7.25, 2.11.13, 2.12.10, 2.13.5 |
Published upstream
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.