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CVE-2026-28281

HIGH CVSS 3.1: 7.1 EPSS 0.02%
Updated Mar 13, 2026
Instantcms
Parameter Value
CVSS 7.1 (HIGH)
Affected Versions before 2.18.1
Fixed In 2.18.1
Type CWE-352 (Cross-Site Request Forgery (CSRF))
Vendor Instantcms
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
Low
Partial data leak
Integrity
High
Complete data modification
Availability
None
No disruption

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Instantcms Instantcms
cpe:2.3:a:instantcms:instantcms:*:*:*:*:*:*:*:*
2.18.1