Read the docs
TI-2020-10951 Aliases CVE-2020-13978GHSA-2cfh-cfhm-pm58

Monstra CMS 3.0.4 allows an attacker, who already has administrative access to modify…

Priority HIGH 65CWE-78Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-78.

Summary

Monstra 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 OS commands via the Theme Module by visiting the admin/index.php?id=themes&action=edit_chunk URI. NOTE: there is no indication that the Edit Chunk feature was intended to prevent an administrator from using PHP's exec feature

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01272 70th 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

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:monstra:monstra_cms:3.0.4:*:*:*:*:*:*:*3.0.4VulnerableMonstra
  • 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

  1. 2026-10-02 Threatist record created from CVE-2020-13978
  2. 2026-10-03 Alias added: GHSA-2cfh-cfhm-pm58

References

Exploit 1

  • TI-2025-42952 Monstra CMS v3.0.4 contains an arbitrary file upload vulnerability in the Files Manager… CVSS 3.1HIGH 8.8
  • 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-2020-13908 An issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML… CVSS 3.1MEDIUM 6.5
  • 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