CVE-2026-50290
Published:August 21, 2026
Updated:September 24, 2026
SpecifyJS is a declarative TypeScript user interface framework. Prior to version 0.2.136, CSS value sanitization stripped "expression(" and "url(javascript:" using simple regex, but could be bypassed with CSS unicode escapes ("\65xpression("), null bytes, or CSS comments ("exp/**/ression("). These CSS injection vectors only work in legacy browsers (IE6-IE10). SpecifyJS targets modern browsers. Starting in version 0.2.136, CSS sanitization now normalizes unicode escapes and strips CSS comments before pattern matching. Also checks for "behavior:", "-moz-binding", and "-o-link" patterns.
Affected Packages
https://github.com/asymmetric-effort/specifyjs.git (GITHUB):
Affected version(s) >=v0.0.7 <v0.2.136Fix Suggestion:
Update to version v0.2.136@asymmetric-effort/specifyjs (NPM):
Affected version(s) >=0.0.6 <0.2.136Fix Suggestion:
Update to version 0.2.136Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS
Base Score:
0.36