6

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

Deferred
AliasesGHSA-xp3c-3jw3-4vcrBIT-openbao-2026-63131GO-2026-6579
Published 23-09-2026Last modified 24-09-2026

Vulnerability summary

CVE-2026-63131 is a medium (CVSS 6.0) Incorrect Authorization vulnerability in openbao. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.9% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
6.0/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.35%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 23-09-2026
    PublishedVulnerability first disclosed.
  2. 24-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

28%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

24-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Github.com/openbao1 product
  • openbao< 0.0.0-20260713133043-f58d848c139e | ≥ 0.1.0, ≤ 1.1.5 | ≥ 0.1.0, < 0.0.0-20260713133043-f58d848c139e
Openbao1 product

2 vendors · 2 products

References

8 links