CVE-2026-28281

Name: CVE-2026-28281
Creator: NVD / NIST
Published: 2026-03-10T17:38:39.103+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.13%

Last modified Jun 17, 2026

CVE-2026-28281 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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. EPSS estimates a 0.13% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.1/10

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

EPSS Probability

0.13%

2.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Instantcms	Instantcms	< 2.18.1

References

https://github.com/instantsoft/icms2/security/advisories/GHSA-pp43-262q-h73mExploit, Mitigation, Vendor Advisory

Timeline

Published: Mar 10, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-28281?

How severe is CVE-2026-28281?

CVE-2026-28281 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.

How do I fix CVE-2026-28281?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-28281?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST