CVE-2026-45021

medium

Published 2026-05-14 · Modified 2026-05-28

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CVSS v3

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CVSS v4 NEW

5.1

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

VIR risk

5.5

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Package impact

Ecosystem	Package	Vulnerable	Fixed
Go	github.com/kumahq/kuma	`<2.7.25`	`2.7.25`
Go	github.com/kumahq/kuma	`>=2.9.0,<2.9.15`	`2.9.15`
Go	github.com/kumahq/kuma	`>=2.11.0,<2.11.13`	`2.11.13`
Go	github.com/kumahq/kuma	`>=2.12.0,<2.12.10`	`2.12.10`
Go	github.com/kumahq/kuma	`>=2.13.0,<2.13.5`	`2.13.5`
GO	github.com/kumahq/kuma	`>= 2.13.0, < 2.13.5`	`2.13.5`
GO	github.com/kumahq/kuma	`>= 2.12.0, < 2.12.10`	`2.12.10`
GO	github.com/kumahq/kuma	`>= 2.11.0, < 2.11.13`	`2.11.13`
GO	github.com/kumahq/kuma	`>= 2.9.0, < 2.9.15`	`2.9.15`
GO	github.com/kumahq/kuma	`< 2.7.25`	`2.7.25`

References

CWEs

CWE-346 CWE-942

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.