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

Quick assessment

Affected
openbao openbao
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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. Wh

CVSS 6.0 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
openbao openbao < 2.6.0 affected
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I. Basic Information for CVE-2026-63131

Vulnerability Information

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Vulnerability Title
OpenBao LIST ACL bypass: a trailing-slash LIST request skips a more-specific deny rule (unported Vault v2.0.3 fix)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
openbao openbao < 2.6.0 -

II. Public POCs for CVE-2026-63131

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III. Intelligence Information for CVE-2026-63131

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Vendor Pages for CVE-2026-63131 (1)

Other References for CVE-2026-63131 (6)

Same Patch Batch · openbao · 2026-09-23 · 3 CVEs total

CVE-2026-63132 9.2 CRITICAL OpenBao's Recovery Mode Vulnerable To Token Leakage via Timing Attack
CVE-2026-77285 2.4 LOW OpenBao Agent Writes Secrets to Stdout

IV. Related Vulnerabilities

Same product: openbao
Same vendor: openbao
Same weakness: CWE-863

V. Comments for CVE-2026-63131

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