CVE-2026-63131 (GCVE-0-2026-63131)
Vulnerability from cvelistv5 – Published: 2026-09-23 17:59 – Updated: 2026-09-24 14:15
VLAI
EPSS
VEX
Title
OpenBao LIST ACL bypass: a trailing-slash LIST request skips a more-specific deny rule (unported Vault v2.0.3 fix)
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-24 14:14 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/openbao/openbao/security/advis… | x_refsource_CONFIRM |
| https://github.com/openbao/openbao/pull/3389 | x_refsource_MISC |
| https://github.com/openbao/openbao/pull/3474 | x_refsource_MISC |
| https://github.com/openbao/openbao/commit/2e9625d… | x_refsource_MISC |
| https://github.com/openbao/openbao/commit/f58d848… | x_refsource_MISC |
| https://github.com/hashicorp/vault/blob/main/CHAN… | x_refsource_MISC |
| https://github.com/openbao/openbao/releases/tag/v2.6.0 | x_refsource_MISC |
Impacted products
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"x_refsource_MISC"
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{
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"tags": [
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{
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"tags": [
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],
"url": "https://github.com/openbao/openbao/commit/f58d848c139e5ba71aa63103fcfe101972b999fc"
},
{
"name": "https://github.com/hashicorp/vault/blob/main/CHANGELOG.md#203",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/hashicorp/vault/blob/main/CHANGELOG.md#203"
},
{
"name": "https://github.com/openbao/openbao/releases/tag/v2.6.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/openbao/openbao/releases/tag/v2.6.0"
}
],
"source": {
"advisory": "GHSA-xp3c-3jw3-4vcr",
"discovery": "UNKNOWN"
},
"title": "OpenBao LIST ACL bypass: a trailing-slash LIST request skips a more-specific deny rule (unported Vault v2.0.3 fix)"
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],
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"lastModified": "2026-09-24T15:17:26.640",
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"Recovery": "NOT_DEFINED",
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"modifiedAttackComplexity": "NOT_DEFINED",
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"title": "github.com/openbao/openbao: OpenBao: Information disclosure via Access Control List (ACL) bypass",
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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