CVE-2026-55774Network attack vectorHinoki check available

Cross-namespace credential revocation via unscoped lease lookup

Published Sep 15, 2026 · Updated Sep 15, 2026

Incorrect authorization in OpenBao before 2.5.5 allows remote authenticated users to revoke cross-namespace leases using known lease IDs. In vault/expiration.go, FetchLeaseInfo returned cached entries without comparing their namespace to the request context, while loadEntry rewrote the context from the lease ID before reading storage. Access to sys/leases/revoke in any namespace and a foreign lease ID are required; revocation invalidates the lease and its underlying credential.

CVSS severity2.1
Low
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect authorization in OpenBao before 2.5.5 allows remote authenticated users to revoke cross-namespace leases using known lease IDs. In vault/expiration.go, FetchLeaseInfo returned cached entries without comparing their namespace to the request context, while loadEntry rewrote the context from the lease ID before reading storage. Access to sys/leases/revoke in any namespace and a foreign lease ID are required; revocation invalidates the lease and its underlying credential.

The record

CVE
CVE-2026-55774
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
OpenBao
Product
OpenBao
Classifications
CWE-863, T1531
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.5.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenBao · OpenBaoversion=< 2.5.5

Published CVSS scores

2.1GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1531Account Access Removal

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo