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TI-2026-37032 Aliases CVE-2026-50290GHSA-93q6-wwjh-jc6h

@asymmetric-effort/specifyjs: CSS expression sanitization is bypassable in renderToString

Priority LOW 25CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00489 42nd percentileScored 2026-11-07
Fix Fixed specifyjs (asymmetric-effort): 0.2.136@asymmetric-effort/specifyjs (npm): 0.2.136

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

VendorProductAffected versionsFixed inStatusSource
asymmetric-effortspecifyjsbefore 0.2.1360.2.136Patch availableCNA
—@asymmetric-effort/specifyjs (npm)before 0.2.1360.2.136Patch availableGHSA-93q6-wwjh-jc6h
  • specifyjs Vendorasymmetric-effort Affected before 0.2.136 Fixed in 0.2.136 Patch available CNA
  • @asymmetric-effort/specifyjs (npm) Vendor— Affected before 0.2.136 Fixed in 0.2.136 Patch available GHSA-93q6-wwjh-jc6h

Remediation

  • Fix · CNA specifyjs (asymmetric-effort) Fixed in 0.2.136
  • Fix · GHSA-93q6-wwjh-jc6h @asymmetric-effort/specifyjs (npm) Fixed in 0.2.136 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-50290
  2. 2026-10-03 Alias added: GHSA-93q6-wwjh-jc6h

References

Other 3

  • TI-2026-37030 @asymmetric-effort/specifyjs: URL parse failure silently allows request CVSS 4.0HIGH 8.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences