CVE-2026-28281 Details
Description
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.
A Cross-Site Request Forgery (CSRF) vulnerability has been identified in InstantCMS versions prior to 2.18.1. The issue arises because the application does not properly validate CSRF tokens, enabling attackers to perform various actions on behalf of users. These actions include granting moderator privileges, executing scheduled tasks, moving posts to the trash, and accepting friend requests. The vulnerability can be exploited by manipulating POST requests into GET requests, taking advantage of the lack of CSRF token verification on sensitive actions.
Users are advised to update to InstantCMS version 2.18.1, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 10, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/instantsoft/icms2/security/advisories/GHSA-pp43-262q-h73m | [email protected] | ExploitMitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-352 | Cross-Site Request Forgery (CSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| instantcms instantcms | < 2.18.1 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 13, 2026 | Initial Analysis | [email protected] |
| Mar 10, 2026 | New CVE Received | [email protected] |