WordPress Custom 404 Pro Plugin <= 3.10.0 is vulnerable to Cross Site Scripting (XSS)
Priority LOW 31CWE-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 · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kunal Nagar Custom 404 Pro allows Stored XSS.This issue affects Custom 404 Pro: from n/a through 3.10.0.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00351 28th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Kunal Nagar | Custom 404 Pro | up to 3.10.0 | — | No fix listed | CNA |
- Custom 404 Pro VendorKunal Nagar Affected up to 3.10.0 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:kunalnagar:custom_404_pro:*:*:*:*:*:wordpress:*:* | up to 3.10.0 | Vulnerable | Kunal Nagar |
- cpe:2.3:a:kunalnagar:custom_404_pro:*:*:*:*:*:wordpress:*:* Versions up to 3.10.0 Vulnerable ·Kunal Nagar
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-51540
- 2026-10-03 Alias added: GHSA-77pp-vwgv-x2jq
References
More Kunal Nagar Custom 404 Pro vulnerabilities
- TI-2023-01909 Custom 404 Pro < 3.8.1 - Multiple SQL Injection CVSS 3.1CRITICAL 9.8
- TI-2023-01900 Custom 404 Pro < 3.7.3 - Reflected Cross-Site Scripting CVSS 3.1MEDIUM 6.1
- TI-2022-23643 WordPress Custom 404 Pro Plugin <= 3.7.0 is vulnerable to SQL Injection (SQLi) CVSS 3.1HIGH 8.3
- TI-2024-26570 WordPress Custom 404 Pro plugin <= 3.11.1 - Reflected Cross Site Scripting (XSS) vulnerability CVSS 3.1HIGH 7.1
- TI-2019-10995 The Custom 404 Pro plugin 3.2.8 for WordPress has XSS via the wp-admin/admin.php?page=c4p-main page parameter. CVSS 3.0MEDIUM 6.1
- TI-2019-11905 The custom-404-pro plugin before 3.2.8 for WordPress has reflected XSS, a different vulnerability than CVE-2019-14789. CVSS 3.0MEDIUM 6.1
Sources
- CVE-2023-51540 · CVE Program
- CVE-2023-51540 · NVD
- FIRST EPSS
- GHSA-77pp-vwgv-x2jq · 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