TI-2020-13908 Aliases CVE-2020-20691 GHSA-2648-mr6g-p443

An issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML…

LOW 31CWE-434Published 2021-09-27 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-434.

Summary

An issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML via bypassing the file extension filter and uploading crafted HTML files.

Why it matters now

EPSS 0.00926 60th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:monstra:monstra_cms:3.0.4:::::::*	3.0.4	Vulnerable	Monstra

cpe:2.3:a:monstra:monstra_cms:3.0.4:*:*:*:*:*:*:* Versions 3.0.4 Vulnerable ·Monstra

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2020-20691
2026-10-03 Alias added: GHSA-2648-mr6g-p443

References

Exploit 1

https://github.com/monstra-cms/monstra/issues/461

TI-2025-42952 Monstra CMS v3.0.4 contains an arbitrary file upload vulnerability in the Files Manager… CVSS 3.1HIGH 8.8
TI-2020-10951 Monstra CMS 3.0.4 allows an attacker, who already has administrative access to modify… CVSS 3.1HIGH 7.2
TI-2018-08345 plugins/box/users/users.plugin.php in Monstra CMS 3.0.4 allows Login Rate Limiting Bypass… CVSS 3.0CRITICAL 9.8
TI-2020-14490 Monstra CMS 3.0.4 allows attackers to execute arbitrary code via a crafted payload… CVSS 3.1HIGH 8.8
TI-2018-07989 Monstra CMS 3.0.4 and earlier has XSS via index.php. CVSS 3.0MEDIUM 6.1
TI-2020-14643 Cross Site Scripting vulnerabilty in Monstra CMS 3.0.4 via the page feature in admin/index.php. CVSS 3.1MEDIUM 5.4

See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences