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Vulnerability record · CVE-2026-28281 · published 10 March 2026

CVE-2026-28281: Instantcms cross-site request forgery vulnerability

Instantcms · Instantcms

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.

7.1 CVSS 3.1 High EPSS 0.17% · top 94.9% CWE-352 · Cross-site request forgery
7.1CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/instantsoft/icms2/security/advisories/GHSA-pp43-262q-h73m ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.3CVE-2013-10051Instantcms vulnerabilityA remote PHP code execution vulnerability exists in InstantCMS version 1.6 and earlier due to unsafe use of eval() within the search view handler. Sp…EPSS 2.8%9.1CVE-2023-4188Instantcms sql injection vulnerabilitySQL Injection in GitHub repository instantsoft/icms2 prior to 2.16.1-git.EPSS 0.93%7.2CVE-2025-59055Instantcms server-side request forgery (ssrf) vulnerabilityInstantCMS is a free and open source content management system. A blind Server-Side Request Forgery (SSRF) vulnerability in InstantCMS up to and incl…EPSS 0.45%7.2CVE-2024-31212Instantcms improper input validation vulnerabilityInstantCMS is a free and open source content management system. A SQL injection vulnerability affects instantcms v2.16.2 in which an attacker with ad…EPSS 0.85%6.1CVE-2023-4655Instantcms cross-site scripting vulnerabilityCross-site Scripting (XSS) - Reflected in GitHub repository instantsoft/icms2 prior to 2.16.1.EPSS 0.47%6.1CVE-2018-14382Instantcms cross-site scripting vulnerabilityInstantCMS 2.10.1 has /redirect?url= XSS.EPSS 0.87%5.4CVE-2024-50348Instantcms cross-site scripting vulnerabilityInstantCMS is a free and open source content management system. In photo upload function in the photo album page there is no input validation taking …EPSS 0.33%5.4CVE-2024-31213Instantcms open redirect vulnerabilityInstantCMS is a free and open source content management system. An open redirect was found in the ICMS2 application version 2.16.2 when being redirec…EPSS 0.40%

Source: NIST National Vulnerability Database (record CVE-2026-28281), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.