High severity · published Mar 9, 2026
CVE-2026-28281
InstantCMS has Multiple CSRF Vulnerabilities
7.1
CVSS
0.1%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IC
icms2 · instantsoft
< 2.18.1 · source: vendor
IN
Instantcms · Instantcms
before 2.18.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28281
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28281
Exploit
https://github.com/instantsoft/icms2/security/advisories/GHSA-pp43-262q-h73m
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