CVE-2026-5751: justhtml
- Severity
- 5.1 (MEDIUM)
- Vendor
- JUSTHTML
- Affected versions
- 0 through before 1.14.0
- Fixed version
- 1.14.0
- Patch status
- Patched
- Published
- 2026-08-23T14:16:53.807
- Modified
- 2026-08-23T14:16:53.807
Why it matters
Vulnerability requiring standard triage and vendor validation.
Recommended admin actions
- Review during normal vulnerability triage unless the affected system is internet-facing or business-critical.
- Review logs for suspicious activity related to the affected application or component.
Technical summary
justhtml versions 1.13.0 and earlier contain a parser-differential / mutation cross-site scripting (mXSS) vulnerability when using a custom SanitizationPolicy that preserves foreign namespaces (e.g., drop_foreign_namespaces=False with allowlisted SVG/MathML elements or raw-text containers such as ). Specially crafted input can sanitize into markup that appears safe but becomes unsafe when re-parsed by a browser or another HTML parser, allowing markup injection. The default safe configuration (sanitize=True) is not affected. Fixed in 1.14.0.
View the official NVD record for CVE-2026-5751
CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.
VULNERABILITY PULSE
| AFFECTED PRODUCT | ACTION | ||
|---|---|---|---|
| CVE-2026-78155 |
StackGres
Reporter: CVE
|
9.9
CRITICAL
|
VIEW RECORD |
| CVE-2026-5388 |
justhtml PATCH
Reporter: DISCLOSURE
|
9.3
CRITICAL
|
VIEW RECORD |
| CVE-2026-7808 |
justhtml PATCH
Reporter: DISCLOSURE
|
9.3
CRITICAL
|
VIEW RECORD |
| CVE-2026-8445 |
justhtml PATCH
Reporter: DISCLOSURE
|
9.3
CRITICAL
|
VIEW RECORD |
| CVE-2026-0551 |
PPWP – Password Protect Pages
Reporter: SECURITY
|
8.8
HIGH
|
VIEW RECORD |
| CVE-2026-16149 |
Security Hardener
Reporter: SECURITY
|
8.8
HIGH
|
VIEW RECORD |
| CVE-2026-4671 |
justhtml PATCH
Reporter: DISCLOSURE
|
8.7
HIGH
|
VIEW RECORD |
| CVE-2026-9769 |
justhtml PATCH
Reporter: DISCLOSURE
|
8.7
HIGH
|
VIEW RECORD |
| CVE-2026-78050 |
CF-N1-S
Reporter: CNA
|
8.6
HIGH
|
VIEW RECORD |
| CVE-2026-10053 |
GitLab PATCH
Reporter: CVE
|
8.5
HIGH
|
VIEW RECORD |
| CVE-2026-78122 |
docker-socket-proxy
Reporter: DISCLOSURE
|
8.3
HIGH
|
VIEW RECORD |
| CVE-2026-78136 |
CHIRP PATCH
Reporter: CVE
|
7.8
HIGH
|
VIEW RECORD |
| CVE-2026-47895 |
strongSwan PATCH
Reporter: CVE
|
7.5
HIGH
|
VIEW RECORD |
| CVE-2026-77115 |
Brave
Reporter: CONTACT
|
7.1
HIGH
|
VIEW RECORD |
| CVE-2026-18027 |
WebToffee WooCommerce PDF Invoices, Packing Slips, Delivery Notes & Shipping Labels
Reporter: SECURITY
|
6.5
MEDIUM
|
VIEW RECORD |
| CVE-2026-78051 |
MeTube PATCH
Reporter: CNA
|
5.5
MEDIUM
|
VIEW RECORD |
| CVE-2026-78062 |
TaxHacker
Reporter: CNA
|
5.5
MEDIUM
|
VIEW RECORD |
| CVE-2026-12999 |
zephyr
Reporter: VULNERABILITIES
|
5.3
MEDIUM
|
VIEW RECORD |
| CVE-2026-78061 |
TaxHacker
Reporter: CNA
|
5.3
MEDIUM
|
VIEW RECORD |
| CVE-2026-77088 |
justhtml PATCH
Reporter: DISCLOSURE
|
5.3
MEDIUM
|
VIEW RECORD |
| CVE-2026-5389 |
justhtml PATCH
Reporter: DISCLOSURE
|
5.1
MEDIUM
|
VIEW RECORD |
| CVE-2026-5751 |
justhtml PATCH
Reporter: DISCLOSURE
|
5.1
MEDIUM
|
VIEW RECORD |
| CVE-2026-6827 |
justhtml PATCH
Reporter: DISCLOSURE
|
5.1
MEDIUM
|
VIEW RECORD |
| CVE-2026-74793 |
justhtml PATCH
Reporter: DISCLOSURE
|
5.1
MEDIUM
|
VIEW RECORD |
| CVE-2026-8630 |
justhtml PATCH
Reporter: DISCLOSURE
|
5.1
MEDIUM
|
VIEW RECORD |
| CVE-2026-14853 |
WooCommerce Bookings PATCH
Reporter: CONTACT
|
4.3
MEDIUM
|
VIEW RECORD |
| CVE-2026-77116 |
Brave
Reporter: CONTACT
|
4.3
MEDIUM
|
VIEW RECORD |
| CVE-2026-78049 |
S2OPC
Reporter: CNA
|
2.9
LOW
|
VIEW RECORD |
| CVE-2026-77003 |
Content Mask PATCH
Reporter: CONTACT
|
2.7
LOW
|
VIEW RECORD |
| CVE-2026-78054 |
Class and Exam Timetabling System
Reporter: CNA
|
2.1
LOW
|
VIEW RECORD |
| CVE-2026-78055 |
Class and Exam Timetabling System
Reporter: CNA
|
2.1
LOW
|
VIEW RECORD |
| CVE-2026-78056 |
Student-Management-System
Reporter: CNA
|
2.1
LOW
|
VIEW RECORD |
| CVE-2026-78057 |
Student-Management-System
Reporter: CNA
|
2.1
LOW
|
VIEW RECORD |
| CVE-2026-78059 |
Stock Management System
Reporter: CNA
|
2.1
LOW
|
VIEW RECORD |
| CVE-2026-78060 |
Stock Management System
Reporter: CNA
|
2.1
LOW
|
VIEW RECORD |
| CVE-2026-78063 |
CH22
Reporter: CNA
|
2.1
LOW
|
VIEW RECORD |
| CVE-2026-78112 |
Hospital Management System Project in PHP
Reporter: CNA
|
2.1
LOW
|
VIEW RECORD |
| CVE-2026-78115 |
Class and Exam Timetabling System
Reporter: CNA
|
2.1
LOW
|
VIEW RECORD |
| CVE-2026-13598 |
RestrictMate PATCH
Reporter: CONTACT
|
0
N/A
|
VIEW RECORD |
| CVE-2026-75922 |
Reverse-Proxy PATCH
Reporter: 9B29ABF9-4AB0-4765-B253-1875CD9B441E
|
0
N/A
|
VIEW RECORD |
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