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Vulnerability record · CVE-2020-23205 · published 1 July 2021

CVE-2020-23205: Monstra cms cross-site scripting vulnerability

Monstra · Monstra Cms

A stored cross site scripting (XSS) vulnerability in Monstra CMS version 3.0.4 allows attackers to execute arbitrary web scripts or HTML via crafted a payload entered into the "Site Name" field under the "Site Settings" module.

5.4 CVSS 3.1 Medium EPSS 0.53% · top 57.4% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score, v2 3.5
0.53%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A stored cross site scripting (XSS) vulnerability in Monstra CMS version 3.0.4 allows attackers to execute arbitrary web scripts or HTML via crafted a payload entered into the "Site Name" field under the "Site Settings" module.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/monstra-cms/monstra/issues/465 ExploitIssue TrackingThird Party Advisory
https://github.com/monstra-cms/monstra/issues/465 ExploitIssue TrackingThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2018-11678Monstra cms improper input validation vulnerabilityplugins/box/users/users.plugin.php in Monstra CMS 3.0.4 allows Login Rate Limiting Bypass via manipulation of the login_attempts cookie.EPSS 1.7%8.8CVE-2025-69906Monstra cms unrestricted file upload vulnerabilityMonstra CMS v3.0.4 contains an arbitrary file upload vulnerability in the Files Manager plugin. The application relies on blacklist-based file extens…EPSS 0.72%8.8CVE-2020-23219Monstra cms code injection vulnerabilityMonstra CMS 3.0.4 allows attackers to execute arbitrary code via a crafted payload entered into the "Snippet content" field under the "Edit Snippet" …EPSS 1.6%7.2CVE-2020-13978Monstra cms os command injection vulnerabilityMonstra CMS 3.0.4 allows an attacker, who already has administrative access to modify .chunk.php files on the Edit Chunk screen, to execute arbitrary…EPSS 1.3%6.5CVE-2020-20691Monstra cms unrestricted file upload vulnerabilityAn issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML via bypassing the file extension filter and uploading crafte…EPSS 0.93%6.1CVE-2018-11227Monstra cms cross-site scripting vulnerabilityMonstra CMS 3.0.4 and earlier has XSS via index.php.EPSS 4.7%5.4CVE-2020-23697Monstra cms cross-site scripting vulnerabilityCross Site Scripting vulnerabilty in Monstra CMS 3.0.4 via the page feature in admin/index.php.EPSS 1.9%5.4CVE-2018-19599Monstra cms cross-site scripting vulnerabilityMonstra CMS 1.6 allows XSS via an uploaded SVG document to the admin/index.php?id=filesmanager&path=uploads/ URI. NOTE: this is a discontinued produc…EPSS 0.73%

Source: NIST National Vulnerability Database (record CVE-2020-23205), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.