EUVD-2026-90665
GHSA-jh5v-v5x3-c3pp
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated network access to the default content API with no interaction (AV:N/AC:L/PR:N/UI:N); confidentiality-only impact, with C:H following the vendor though C:L is defensible for enumeration-grade leakage; no integrity or availability effect.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
Ghost versions from 2.10.0 before 6.63.0 contain a staff enumeration vulnerability in the content API that allows unauthenticated attackers to leak user data. Attackers can observe discrepancies in API metadata responses to enumerate staff members and extract sensitive information without authentication.
Articles & Coverage 1
AnalysisAI
Unauthenticated staff enumeration in Ghost CMS affects every release from 2.10.0 up to (but not including) 6.63.0, allowing remote attackers to infer which staff accounts exist by comparing differences in the metadata returned by the public content API. The flaw is rated High (vendor CVSS 4.0 score 8.7; independent CVSS 3.1 assessment 8.1, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) because it requires no authentication, no user interaction, and only a network-reachable instance with its default content API exposed. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires only a network-reachable Ghost instance running an affected version (2.10.0 up to but not including 6.63.0) with its public content API exposed - the default configuration for a live Ghost site. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 vector (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N) scores this 8.7 (High), driven entirely by a High confidentiality impact over an unauthenticated, network-reachable, low-complexity path with no user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Ghost 6.63.0 or later, the first release outside the vulnerable range and the version the vendor ships as the fix (per the 'Patch: Available from vendor' data and the GitHub advisory GHSA-ffmj-3ppp-cj4r); because the vulnerable range spans 2.10.0 to 6.63.0, sites several major versions behind must plan a staged upgrade rather than a minor bump. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Ghost CMS instances and determine if they are running versions between 2.10.0 and 6.62.x; if so, initiate an emergency change to upgrade to Ghost 6.63.0. …
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External POC / Exploit Code
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