CVE-2026-28281

InstantCMS has Multiple CSRF Vulnerabilities

State: Published
Severity: 7.1 High
Published: Mar 9, 2026
Updated: Mar 10, 2026
Reserved: Feb 26, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N	GitHub_M

Weaknesses

CWE-352 Cross-Site Request Forgery (CSRF)

Affected Products

Product	Versions
icms2instantsoft	< 2.18.1Affected

References

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

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