CVE-2026-59817Network attack vector

Unauthenticated paid memberships via trusted checkout metadata

Published Jul 9, 2026 · Updated Jul 9, 2026

Authorization bypass in Ghost 6.27.0 through 6.43.1 allows remote attackers to obtain paid gift memberships through donation checkout. The donation checkout controller accepted caller-supplied reserved metadata such as ghost_gift, and Stripe webhook routing trusted those values as Ghost-owned. The public donations feature requires no authentication; exploitation grants membership benefits at minimal cost but does not expose data or steal funds.

CVSS severity5.3
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Ghost 6.27.0 through 6.43.1 allows remote attackers to obtain paid gift memberships through donation checkout. The donation checkout controller accepted caller-supplied reserved metadata such as ghost_gift, and Stripe webhook routing trusted those values as Ghost-owned. The public donations feature requires no authentication; exploitation grants membership benefits at minimal cost but does not expose data or steal funds.

The record

CVE
CVE-2026-59817
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Ghost Foundation
Product
Ghost
Classifications
CWE-472, CWE-639, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=>= 6.27.0, < 6.44.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ghost Foundation · Ghostversion=>= 6.27.0, < 6.44.0

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-472External Control of Assumed-Immutable Web Parameter
CWE-639Authorization Bypass Through User-Controlled Key
T1190Exploit Public-Facing Application

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

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Your stack

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