CVE-2026-63131
OpenBao LIST ACL bypass: a trailing-slash LIST request skips a more-specific deny rule (unported Vault v2.0.3 fix)
- State
- Published
- Severity
- 6.0 Medium
- Published
- Sep 23, 2026
- Updated
- Sep 24, 2026
- Reserved
- Jul 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.0 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
- CWE-863 Incorrect Authorization
Affected Products
| Product | Versions |
|---|---|
openbaoopenbao |
|
References
- https://github.com/openbao/openbao/security/advisories/GHSA-xp3c-3jw3-4vcr
- https://github.com/openbao/openbao/pull/3389
- https://github.com/openbao/openbao/pull/3474
- https://github.com/openbao/openbao/commit/2e9625d6cebe4639d051ef53dd6ce7c49914ae6a
- https://github.com/openbao/openbao/commit/f58d848c139e5ba71aa63103fcfe101972b999fc
- https://github.com/hashicorp/vault/blob/main/CHANGELOG.md#203
- https://github.com/openbao/openbao/releases/tag/v2.6.0
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