CMS Made Simple User Management listusers.php cross site scripting
Priority MEDIUM 55CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting, Code execution
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79 and CWE-94.
Summary
A security flaw has been discovered in CMS Made Simple up to 2.2.21. Impacted is an unknown function of the file admin/listusers.php of the component User Management Module. Performing a manipulation of the argument Message results in cross site scripting. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00214 11th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | CMS Made Simple | 2.2.0; 2.2.1; 2.2.2; 2.2.3; 2.2.4; 2.2.5; 2.2.6; 2.2.7; 2.2.8; 2.2.9; 2.2.10; 2.2.11; 2.2.12; 2.2.13; 2.2.14; 2.2.15; 2.2.16; 2.2.17; 2.2.18; 2.2.19; 2.2.20; 2.2.21 | — | No fix listed | CNA |
- CMS Made Simple Vendor— Affected 2.2.0; 2.2.1; 2.2.2; 2.2.3; 2.2.4; 2.2.5; 2.2.6; 2.2.7; 2.2.8; 2.2.9; 2.2.10; 2.2.11; 2.2.12; 2.2.13; 2.2.14; 2.2.15; 2.2.16; 2.2.17; 2.2.18; 2.2.19; 2.2.20; 2.2.21 Fixed in — No fix listed CNA
CPE names CNA · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cms_made_simple:cms_made_simple:*:*:*:*:*:*:*:* | — | — | CMS Made Simple |
- cpe:2.3:a:cms_made_simple:cms_made_simple:*:*:*:*:*:*:*:* Versions — — ·CMS Made Simple
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-4225
- 2026-10-03 Alias added: GHSA-g5vr-q7cx-vw4q
References
Sources
- CVE-2026-4225 · CVE Program
- CVE-2026-4225 · NVD
- FIRST EPSS
- GHSA-g5vr-q7cx-vw4q · GitHub Advisory Database · CC BY 4.0
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