EUVD-2026-90679
GHSA-wmw5-238j-rqvj
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/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
Network-reachable with an existing low-privilege staff account (PR:L) and passive interaction mapped to UI:R; escalation grants high confidentiality/integrity control, no availability impact and no scope change.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
Ghost versions from 2.21.0 before 6.56.0 contain a privilege escalation vulnerability in the notifications system that allows low-privilege staff users to escalate to higher-privilege staff roles. Attackers with low-privilege staff access can exploit the notifications system to gain elevated privileges without proper authorization checks.
Articles & Coverage 1
AnalysisAI
Privilege escalation in Ghost CMS (versions 2.21.0 before 6.56.0) allows an authenticated low-privilege staff user to elevate their role to a higher-privilege staff position by exploiting missing authorization checks in the notifications system. Exploitation requires an existing staff account and passive interaction from a higher-privileged user (CVSS 4.0 PR:L/UI:P), so multi-author or multi-staff deployments are primarily at risk; single-author sites have negligible exposure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an existing authenticated low-privilege staff account on the target Ghost instance (PR:L) - this is NOT exploitable by anonymous internet users, so it is primarily a threat to multi-user/multi-author deployments where untrusted or semi-trusted staff accounts exist. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a credentialed privilege-escalation flaw (CWE-266) in Ghost's notifications system, and the signals paint a 'serious-but-gated' picture rather than an internet-wide emergency. … 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 | Vendor-released patch: upgrade to Ghost 6.56.0 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Ghost CMS instances to identify those running versions between 2.21.0 and 6.55.x, and prioritize multi-staff deployments for immediate action. …
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Same weakness CWE-266 – Incorrect Privilege Assignment
View allSame technique Privilege Escalation
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External POC / Exploit Code
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