underConstruction <= 1.18 - Reflected Cross-Site Scripting
Priority LOW 32CWE-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
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The underConstruction plugin <= 1.18 for WordPress echoes out the raw value of `$GLOBALS['PHP_SELF']` in the ucOptions.php file. On certain configurations including Apache+modPHP, this makes it possible to use it to perform a reflected Cross-Site Scripting attack by injecting malicious code in the request path.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02324 83rd 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 |
|---|---|---|---|---|---|
| Noah Kagan | underConstruction | 1.18 – 1.18 | — | No fix listed | CNA |
- underConstruction VendorNoah Kagan Affected 1.18 – 1.18 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:underconstruction_project:underconstruction:*:*:*:*:*:wordpress:*:* | before 1.19 | Vulnerable | Underconstruction Project |
- cpe:2.3:a:underconstruction_project:underconstruction:*:*:*:*:*:wordpress:*:* Versions before 1.19 Vulnerable ·Underconstruction Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-39320
- 2026-10-03 Alias added: GHSA-p83h-qp2w-3vv5
References
More Noah Kagan vulnerabilities
- TI-2024-16379 WordPress Scroll Triggered Box Plugin <= 2.3 is vulnerable to Cross Site Scripting (XSS) CVSS 3.1MEDIUM 6.5
- TI-2024-20272 WordPress underConstruction plugin <= 1.21 - Cross Site Scripting (XSS) vulnerability CVSS 3.1MEDIUM 5.9
Sources
- CVE-2021-39320 · CVE Program
- CVE-2021-39320 · NVD
- FIRST EPSS
- GHSA-p83h-qp2w-3vv5 · 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