CVE-2024-50348: InstantCMS has a Cross Site Scripting Vulnerability

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-10-29 · updated 2026-06-17
Weakness: CWE-79

Description

InstantCMS is a free and open source content management system. In photo upload function in the photo album page there is no input validation taking place. Due to this attackers are able to inject the XSS (Cross Site Scripting) payload and execute. This vulnerability is fixed in 2.16.3.

Affected products

InstantCMS: before 2.16.3 — fixed in 2.16.3

How to fix

Upgrade to a fixed version: InstantCMS 2.16.3. Check the vendor advisory for mitigations.

References

https://github.com/instantsoft/icms2/commit/e02de2fa1850bb40c9b2050b9256c838a0ea7aa3
https://github.com/instantsoft/icms2/security/advisories/GHSA-f6cf-jg84-fw29

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