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TI-2026-21300 Aliases CVE-2026-26351GHSA-98hq-gxg8-fchj

GetSimpleCMS-CE < 3.3.22 Stored XSS via components.php

Priority LOW 22CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

GetSimpleCMS Community Edition (CE) versions prior to 3.3.22 (3.3.16 tested) contains a stored cross-site scripting (XSS) vulnerability in the Theme to Components functionality within components.php. User-supplied input provided to the "slug" field of a component is stored without proper output encoding. While other fields are sanitized using safe_slash_html(), the slug parameter is written to XML and later rendered in the administrative interface without sanitation, resulting in persistent execution of arbitrary JavaScript. An authenticated administrator can inject malicious script content that executes whenever the affected Components page is viewed by any authenticated user, enabling session hijacking, unauthorized administrative actions, and persistent compromise of the CMS administrative interface.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00333 26th percentileScored 2026-11-07
Fix Fixed GetSimpleCMS-CE (GetSimpleCMS-CE): 3.3.22

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
GetSimpleCMS-CEGetSimpleCMS-CE3.3.163.3.22Patch availableCNA
  • GetSimpleCMS-CE VendorGetSimpleCMS-CE Affected 3.3.16 Fixed in 3.3.22 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:getsimple-ce:getsimple_cms:*:*:*:*:community:*:*:*3.3.16 to before 3.3.22VulnerableGetSimpleCMS-CE
  • cpe:2.3:a:getsimple-ce:getsimple_cms:*:*:*:*:community:*:*:* Versions 3.3.16 to before 3.3.22 Vulnerable ·GetSimpleCMS-CE

Remediation

  • Fix · CNA GetSimpleCMS-CE (GetSimpleCMS-CE) Fixed in 3.3.22

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26351
  2. 2026-10-03 Alias added: GHSA-98hq-gxg8-fchj

References

Patch 1

Advisory 1

Other 1

  • TI-2024-36775 GetSimple CMS CE 3.3.19 suffers from arbitrary code execution in the template editing… CVSS 3.1CRITICAL 9.8
  • TI-2025-30771 GetSimple CMS RCE in Edit component CVSS 4.0HIGH 8.6
  • TI-2024-36777 GetSimple CMS CE 3.3.19 is vulnerable to Server-Side Request Forgery (SSRF) in the backend plugin module. CVSS 3.1HIGH 8.8
  • TI-2026-21637 GetSimple CMS: Uploaded Files (feature) Arbitrary File Read Vulnerability CVSS 4.0HIGH 8.8
  • TI-2026-21606 Unauthenticated Information Disclosure via .htaccess Reliance in Sensitive Directories CVSS 4.0HIGH 8.7
  • TI-2024-36776 In the GetSimple CMS CE 3.3.19 management page, Server-Side Request Forgery (SSRF) can be… CVSS 3.1HIGH 7.2
See all 9 →

Sources

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