What’s Vulnerable › Vulnerabilities

CVE-2026-63131: OpenBao LIST ACL bypass: a trailing-slash LIST request skips a more-specific deny rule (unported Vault v2.0.3 fix)

• Severity: medium (CVSS 6.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-23 · updated 2026-09-29
• Weakness: CWE-863

Description

OpenBao is an open source identity-based secrets management system. Prior to 2.6.0, OpenBao's vault/policy/acl.go could evaluate a broader wildcard ACL grant before more-specific trailing-wildcard ACL paths with capabilities = ["deny"] for a LIST operation. When a parent path permitted LIST and a child path was denied, the trailing-slash lookup could therefore allow listing the denied path. Other operation types are outside the repository advisory's affected scope. This issue is fixed in version 2.6.0.

Affected products

• openbao: before 2.6.0

References

• https://github.com/hashicorp/vault/blob/main/CHANGELOG.md#203
• https://github.com/openbao/openbao/commit/2e9625d6cebe4639d051ef53dd6ce7c49914ae6a
• https://github.com/openbao/openbao/commit/f58d848c139e5ba71aa63103fcfe101972b999fc
• https://github.com/openbao/openbao/pull/3389
• https://github.com/openbao/openbao/pull/3474
• https://github.com/openbao/openbao/releases/tag/v2.6.0
• https://github.com/openbao/openbao/security/advisories/GHSA-xp3c-3jw3-4vcr

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