CVE-2026-8621

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-14. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.7%
EPSS %ILE
51st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

May 14, 2026

Last Modified

October 8, 2026

Advisory Details (4)

Auto-updated May 14, 2026
Patch available.
generic

Crabbox < v0.12.0 Authentication Bypass via Header Spoofing | Advisories | VulnCheck

https://www.vulncheck.com/advisories/crabbox-authentication-bypass-via-header-spoofing
generic

Release v0.12.0 · openclaw/crabbox · GitHub

https://github.com/openclaw/crabbox/releases/tag/v0.12.0
generic

[security] fix: ignore identity headers for shared token auth by Hinotoi-agent · Pull Request #70 · openclaw/crabbox · GitHub

https://github.com/openclaw/crabbox/pull/70
generic

fix: ignore identity headers for shared token auth · openclaw/crabbox@b657323 · GitHub

https://github.com/openclaw/crabbox/commit/b657323f1d1c954cefc8444571fa6c45a8896e7f

Vendor Advisories for CVE-2026-8621(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/openclaw/crabbox—
  • every version up to 0.12.0: fixed in 0.12.0
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 31× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 167 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:13 UTCEPSS rescore
  4. 2026-10-08 16:42 UTCEG score recompute
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  6. 2026-10-07 23:48 UTCEPSS rescore
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  11. 2026-09-30 15:04 UTCEPSS rescore
  12. 2026-09-30 04:58 UTCOSV refresh
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  1. 2026-09-15 03:12 UTCEPSS rescore
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  6. 2026-09-11 07:53 UTCOSV refresh
  7. 2026-09-08 22:01 UTCEPSS rescore
  8. 2026-09-06 13:48 UTCEPSS rescore
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  21. 2026-08-23 17:38 UTCEG score recompute
  22. 2026-08-23 00:19 UTCEPSS rescore
  23. 2026-08-22 01:47 UTCEG score recompute
  24. 2026-08-21 23:49 UTCEPSS rescore
  25. 2026-08-20 22:56 UTCEPSS rescore
  26. 2026-08-20 19:34 UTCEG score recompute
  27. 2026-08-19 17:04 UTCEPSS rescore
  28. 2026-08-18 13:49 UTCEPSS rescore
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  31. 2026-08-17 10:22 UTCEG score recompute
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  40. 2026-08-12 13:51 UTCEPSS rescore
  41. 2026-08-11 15:24 UTCEG score recompute
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  44. 2026-08-11 00:00 UTCEPSS rescore
  45. 2026-08-09 14:36 UTCEG score recompute
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  48. 2026-08-08 16:37 UTCEPSS rescore
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  54. 2026-08-05 19:17 UTCEPSS rescore
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  63. 2026-08-01 04:16 UTCEPSS rescore
  64. 2026-07-30 16:28 UTCEPSS rescore
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  72. 2026-07-23 03:23 UTCEG score recompute
  73. 2026-07-22 14:08 UTCEPSS rescore
  74. 2026-07-21 15:25 UTCEPSS rescore
  75. 2026-07-21 15:25 UTCEPSS rescore

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Same product

2 shown

Go:github.com/openclaw/crabbox

Frequently asked(5)

What is CVE-2026-8621?
CVE-2026-8621 is a high vulnerability published on May 14, 2026. 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…
When was CVE-2026-8621 disclosed?
CVE-2026-8621 was first published on May 14, 2026, with the most recent update on October 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8621 actively exploited?
CVE-2026-8621 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-8621?
CVE-2026-8621 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-8621?
A fix for CVE-2026-8621 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-8621 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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