CVE-2026-28281 InstantCMS has Multiple CSRF Vulnerabilities
Attackers can perform unauthorized actions like granting moderator privileges or modifying posts due to missing CSRF token validation in InstantCMS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-28281?
CVE-2026-28281 is a high-severity vulnerability in instantsoft icms2, published on 9 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-352
Which versions are affected by CVE-2026-28281?
It affects 1 product.
Products include Instantcms Instantcms.
How do I fix CVE-2026-28281?
No fix has been published for CVE-2026-28281 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-28281 being exploited?
There is no known exploitation of CVE-2026-28281 in the wild and no public exploit code.
Other vulnerabilities in instantsoft icms2
- CVE-2023-4188 SQL Injection in instantsoft/icms2
- CVE-2013-10051 InstantCMS <= 1.6 Remote PHP Code Execution
- CVE-2023-4704 External Control of System or Configuration Setting in instantsoft/icms2
- CVE-2023-4652 Cross-site Scripting (XSS) - Stored in instantsoft/icms2
- CVE-2024-31212 SQL injection in index_chart_data action
Sources
Also known as GHSA-pp43-262q-h73m.