CVE-2023-3521 json
Cross-site Scripting (XSS) - Reflected in fossbilling/fossbilling
published 2023-07-06 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-44178
- cvss
- 5.4
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 60%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
Cross-site Scripting (XSS) - Reflected in GitHub repository fossbilling/fossbilling prior to 0.5.4.
Patch / fix
- fossbilling fossbilling/fossbilling 0.5.4
- fossbilling fossbilling 0.5.4
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
0.92% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template FOSSBilling < 0.5.3 - Cross-Site Scripting nuclei detection template
- huntr.dev https://huntr.dev/bounties/76a3441d-7f75-4a8d-a7a0-95a7f5456eb0 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 5.4 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected products
- fossbilling fossbilling/fossbilling
- fossbilling fossbilling
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/fossbilling/fossbilling/commit/5eb516d4ebcb764db1b2edf9c8d0539e76ebde52
patch
-
huntr.dev
/bounties/76a3441d-7f75-4a8d-a7a0-95a7f5456eb0
exploit, patch, third-party-advisory
Sources
- CVE List CVE-2023-3521
- NVD CVE-2023-3521
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.