CVE-2026-8621: Crabbox Authentication Bypass Vulnerability

HIGH
Advisory Identifier: GHSA-4g9m-rffv-h6wq
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CVSS 8.8
CWE-287
Published
Advisory Summary

CVE-2026-8621 is a HIGH (CVSS 8.8) authentication bypass vulnerability (CWE-287: Improper Authentication) affecting Crabbox libraries in the Go ecosystem. The issue involves authentication bypass vulnerability that allows impersonation of others by spoofing identity headers. Remediation is available by upgrading affected packages to version 0.12.0.

CVE-2026-8621 at a Glance

CVE Identifier CVE-2026-8621
GHSA Identifier GHSA-4g9m-rffv-h6wq
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-287: Improper Authentication
Affected Product Crabbox
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-8621

To remediate this vulnerability, upgrade all affected Crabbox dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/openclaw/crabbox fixed: 0.12.0 
Upgrade github.com/openclaw/crabbox to 0.12.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/openclaw/crabbox

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-8621, inspect your project dependencies for Crabbox:

inspect dependencies for github.com/openclaw/crabbox

Analyze the terminal output to locate any version of Crabbox in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.12.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Crabbox, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Crabbox prior to v0.12.0 contains an authentication bypass vulnerability that allows non-admin shared-token callers to impersonate other owners or organizations by spoofing identity headers. Attackers can inject malicious X-Crabbox-Owner and X-Crabbox-Org headers in requests authenticated with a shared token to bypass authorization checks and access owner/org-scoped lease operations belonging to victim accounts.

CVE-2026-8621 Affected Crabbox Versions

1 component(s)
Fixed Versions:
0.12.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/openclaw/crabbox
golang/github.com/openclaw/crabbox
Go
< 0.12.0
0.12.0

References

NVD — CVE-2026-8621 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8621
Crabbox Source Repository REPOSITORY
https://github.com/openclaw/crabbox/pull/70
Security Fix Commit FIX COMMIT
https://github.com/openclaw/crabbox/commit/b657323f1d1c954cefc8444571fa6c45a8896e7f
Crabbox Source Repository REPOSITORY
https://github.com/openclaw/crabbox
Crabbox Release RELEASE
https://github.com/openclaw/crabbox/releases/tag/v0.12.0
www.vulncheck.com/advisories/crabbox-... WEB
https://www.vulncheck.com/advisories/crabbox-authentication-bypass-via-header-spoofing

Frequently Asked Questions

What is CVE-2026-8621?
CVE-2026-8621 is a security vulnerability in Crabbox involving authentication bypass vulnerability that allows impersonation of others by spoofing identity headers under CWE-287: Improper Authentication.
Which Crabbox versions are affected?
Affected versions include releases prior to 0.12.0 across affected packages: github.com/openclaw/crabbox.
What version fixes CVE-2026-8621?
Upgrading to 0.12.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/openclaw/crabbox affected?
Yes, github.com/openclaw/crabbox is affected in releases prior to 0.12.0. Upgrade your dependency to 0.12.0 or later.
What is the CVSS score of CVE-2026-8621?
CVE-2026-8621 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-8621?
CVE-2026-8621 is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check Go dependencies for CVE-2026-8621?
Run the dependency tree command: 'inspect dependencies for github.com/openclaw/crabbox'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4g9m-rffv-h6wq",
  "modified" : "2026-05-21T19:29:07Z",
  "published" : "2026-05-14T21:30:43Z",
  "aliases" : [ "CVE-2026-8621" ],
  "summary" : "Crabbox: authentication bypass vulnerability that allows impersonation of others by spoofing identity headers",
  "details" : "Crabbox prior to v0.12.0 contains an authentication bypass vulnerability that allows non-admin shared-token callers to impersonate other owners or organizations by spoofing identity headers. Attackers can inject malicious X-Crabbox-Owner and X-Crabbox-Org headers in requests authenticated with a shared token to bypass authorization checks and access owner/org-scoped lease operations belonging to victim accounts.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/openclaw/crabbox"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.12.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-8621"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/crabbox/pull/70"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/crabbox/commit/b657323f1d1c954cefc8444571fa6c45a8896e7f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openclaw/crabbox"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/crabbox/releases/tag/v0.12.0"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/crabbox-authentication-bypass-via-header-spoofing"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-21T19:29:07Z",
    "nvd_published_at" : "2026-05-14T19:16:39Z"
  }
}