Instantcms
CVE-2026-28281
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
Lifecycle Timeline
2DescriptionGitHub Advisory
InstantCMS is a free and open source content management system. Prior to 2.18.1, InstantCMS does not validate CSRF tokens, which allows attackers grant moderator privileges to users, execute scheduled tasks, move posts to trash, and accept friend requests on behalf of the user. This vulnerability is fixed in 2.18.1.
AnalysisAI
InstantCMS is a free and open source content management system. versions up to 2.18.1 is affected by cross-site request forgery (csrf) (CVSS 7.1).
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | InstantCMS versions prior to 2.18.1 with CSRF token validation disabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.1 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | Fixed in version 2.18.1.. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all InstantCMS instances in your environment and document current versions. …
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External POC / Exploit Code
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