Improper Restriction of Security Token Assignment Affecting github.com/openbao/openbao/vault package, versions <2.5.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published28 Apr 2026
- disclosed21 Apr 2026
- creditZwique
Introduced: 21 Apr 2026
CVE-2026-40264 Â (opens in a new tab)How to fix?
Upgrade github.com/openbao/openbao/vault to version 2.5.3 or higher.
Overview
Affected versions of this package are vulnerable to Improper Restriction of Security Token Assignment via the token store process. An attacker can cause unauthorized renewal or revocation of tokens across namespaces by obtaining token accessors and leveraging privileged administrator access in a different tenant.