CVE-2026-40965CWE-200

Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure

Critical · published June 1, 2026

CVSS v4.0
10.0
EPSS
0%
Percentile
38.6
In the wild
Unconfirmed
What it is

Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure. The server contains a vulnerability where EC (Elliptic Curve) private keys are inadvertently exposed through the public /token_keys endpoint. This endpoint is designed to provide public key material for JWT token verification but incorrectly exposes private key components for EC keys. The vulnerability affects deployments using EC keys for JWT token signing. The vulnerability does not affect RSA key configurations, only deployments using EC keys for JWT signing.

Affected versions:

- uaa_release: v76.12.0 through v78.12.0 (inclusive); fixed in v78.13.0 or later

- CF Deployment: v30.0.0 through v56.0.0 (inclusive); fixed in v56.1.0 or later (bundles uaa_release v78.13.0)

The record
Technical detail
CVSS v4.0
10.0 · CRITICAL
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
EPSS
0.00456 · 38.6th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-06-01T21:22Z
EPSS history
Timeline
  • 01 JUN 21:22Z
    Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure
    cvelistv5