A HTTP Host header attack exists in ExponentCMS 2.6 and below in /exponent_constants.php.
Priority LOW 25CWE-116Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
A HTTP Host header attack exists in ExponentCMS 2.6 and below in /exponent_constants.php. A modified HTTP header can change links on the webpage to an arbitrary value, leading to a possible attack vector for MITM.
Why it matters now
EPSS 0.02468 84th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:exponentcms:exponentcms:*:*:*:*:*:*:*:* | before 2.6 | Vulnerable | Exponentcms |
- cpe:2.3:a:exponentcms:exponentcms:*:*:*:*:*:*:*:* Versions before 2.6 Vulnerable ·Exponentcms
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-38751
- 2026-10-03 Alias added: GHSA-mg75-hvvv-r45q
References
Sources
- CVE-2021-38751 · CVE Program
- CVE-2021-38751 · NVD
- FIRST EPSS
- GHSA-mg75-hvvv-r45q · 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