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TI-2021-19554 Aliases CVE-2021-43742GHSA-gmjx-v99c-7jj2

CMSimple 5.4 is vulnerable to Cross Site Scripting (XSS) via the file upload feature.

Priority LOW 25CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
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-79.

Summary

CMSimple 5.4 is vulnerable to Cross Site Scripting (XSS) via the file upload feature.

Why it matters now

EPSS 0.0057 47th 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

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:cmsimple:cmsimple:5.4:*:*:*:*:*:*:*5.4VulnerableCmsimple
  • cpe:2.3:a:cmsimple:cmsimple:5.4:*:*:*:*:*:*:* Versions 5.4 Vulnerable ·Cmsimple

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43742
  2. 2026-10-03 Alias added: GHSA-gmjx-v99c-7jj2

References

Exploit 1

Other 1

  • TI-2024-37939 CMSimple 5.16 allows the user to edit log.php file via print page. CVSS 3.1CRITICAL 9.1
  • TI-2024-37940 CMSimple 5.16 allows the user to read cms source code through manipulation of the file… CVSS 3.1HIGH 7.5
  • TI-2024-37938 Insecure Permissions vulnerability in CMSimple v.5.16 allows a remote attacker to obtain… CVSS 3.1HIGH 7.5
  • TI-2024-37937 An issue in CMSimple v.5.16 allows a remote attacker to obtain sensitive information via… CVSS 3.1HIGH 7.5
  • TI-2021-22352 CMSimple 5.4 Authenticated Remote Code Execution via Template Editing CVSS 4.0HIGH 8.6
  • TI-2021-22351 CMSimple 5.4 Authenticated Local File Inclusion Remote Code Execution CVSS 4.0HIGH 8.6
See all 18 →

Sources

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