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Vulnerability Details :

CVE-2026-46392

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-05 Jun, 2026 | 18:20
Updated At-05 Jun, 2026 | 19:11
Rejected At-
Credits

HAX CMS PHP Has a Stored XSS via Case-Sensitivity Mismatch in HTML Upload Validation

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Prior to version 26.0.0 of HAX CMS PHP, the `saveFile` endpoint validates upload extensions case-insensitively and writes the filename to disk verbatim, but the `.htaccess` rule that forces `Content-Disposition: attachment` on HTML files is case-sensitive. An HTML file uploaded with an uppercase extension (`.HTML`, `.Html`, `.HTM`) is still served as `text/html` but the forced-download header never applies, so the browser renders it inline and executes any embedded JavaScript in the HAXcms origin. This bypasses the mitigation shipped for CVE-2026-22704. Version 26.0.0 contains a fix.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:05 Jun, 2026 | 18:20
Updated At:05 Jun, 2026 | 19:11
Rejected At:
▼CVE Numbering Authority (CNA)
HAX CMS PHP Has a Stored XSS via Case-Sensitivity Mismatch in HTML Upload Validation

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Prior to version 26.0.0 of HAX CMS PHP, the `saveFile` endpoint validates upload extensions case-insensitively and writes the filename to disk verbatim, but the `.htaccess` rule that forces `Content-Disposition: attachment` on HTML files is case-sensitive. An HTML file uploaded with an uppercase extension (`.HTML`, `.Html`, `.HTM`) is still served as `text/html` but the forced-download header never applies, so the browser renders it inline and executes any embedded JavaScript in the HAXcms origin. This bypasses the mitigation shipped for CVE-2026-22704. Version 26.0.0 contains a fix.

Affected Products
Vendor
haxtheweb
Product
haxcms-php
Versions
Affected
  • < 26.0.0
Problem Types
TypeCWE IDDescription
CWECWE-178CWE-178: Improper Handling of Case Sensitivity
CWECWE-434CWE-434: Unrestricted Upload of File with Dangerous Type
Type: CWE
CWE ID: CWE-178
Description: CWE-178: Improper Handling of Case Sensitivity
Type: CWE
CWE ID: CWE-434
Description: CWE-434: Unrestricted Upload of File with Dangerous Type
Metrics
VersionBase scoreBase severityVector
3.18.7HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Version: 3.1
Base score: 8.7
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qp
x_refsource_CONFIRM
Hyperlink: https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qp
Resource:
x_refsource_CONFIRM
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qp
exploit
Hyperlink: https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qp
Resource:
exploit
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:05 Jun, 2026 | 19:16
Updated At:05 Jun, 2026 | 20:17

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Prior to version 26.0.0 of HAX CMS PHP, the `saveFile` endpoint validates upload extensions case-insensitively and writes the filename to disk verbatim, but the `.htaccess` rule that forces `Content-Disposition: attachment` on HTML files is case-sensitive. An HTML file uploaded with an uppercase extension (`.HTML`, `.Html`, `.HTM`) is still served as `text/html` but the forced-download header never applies, so the browser renders it inline and executes any embedded JavaScript in the HAXcms origin. This bypasses the mitigation shipped for CVE-2026-22704. Version 26.0.0 contains a fix.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.18.7HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Type: Secondary
Version: 3.1
Base score: 8.7
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-178Secondarysecurity-advisories@github.com
CWE-434Secondarysecurity-advisories@github.com
CWE ID: CWE-178
Type: Secondary
Source: security-advisories@github.com
CWE ID: CWE-434
Type: Secondary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qpsecurity-advisories@github.com
N/A
https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qp134c704f-9b21-4f2e-91b3-4a467353bcc0
N/A
Hyperlink: https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qp
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qp
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource: N/A

Change History

0
Information is not available yet

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Details not found