Cross-site Scripting (XSS) - Reflected in fossbilling/fossbilling
Priority MEDIUM 60CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.
Summary
Cross-site Scripting (XSS) - Reflected in GitHub repository fossbilling/fossbilling prior to 0.5.4.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00919 60th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed fossbilling/fossbilling (fossbilling): 0.5.4
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 |
|---|---|---|---|---|---|
| FOSSBilling | fossbilling/fossbilling | before 0.5.4 | 0.5.4 | Patch available | CNA |
- fossbilling/fossbilling VendorFOSSBilling Affected before 0.5.4 Fixed in 0.5.4 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fossbilling:fossbilling:*:*:*:*:*:*:*:* | before 0.5.4 | Vulnerable | FOSSBilling |
- cpe:2.3:a:fossbilling:fossbilling:*:*:*:*:*:*:*:* Versions before 0.5.4 Vulnerable ·FOSSBilling
Remediation
- Fix · CNA fossbilling/fossbilling (fossbilling) Fixed in 0.5.4
Timeline
- 2026-10-02 Threatist record created from CVE-2023-3521
- 2026-10-03 Alias added: GHSA-f2hf-p7mp-7x9v
References
More Fossbilling vulnerabilities
- TI-2023-03258 SQL Injection in fossbilling/fossbilling CVSS 3.1CRITICAL 9.8
- TI-2023-03719 Insufficient Session Expiration in fossbilling/fossbilling CVSS 3.1CRITICAL 9.8
- TI-2023-03259 Unrestricted Upload of File with Dangerous Type in fossbilling/fossbilling CVSS 3.1HIGH 8.8
- TI-2023-03261 Improper Neutralization of Formula Elements in a CSV File in fossbilling/fossbilling CVSS 3.1HIGH 8.0
- TI-2023-03173 Code Injection in fossbilling/fossbilling CVSS 3.1HIGH 7.2
- TI-2023-03330 Open Redirect in alextselegidis/easyappointments CVSS 3.1MEDIUM 6.3
Sources
- CVE-2023-3521 · CVE Program
- CVE-2023-3521 · NVD
- FIRST EPSS
- GHSA-f2hf-p7mp-7x9v · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences