CVE-2026-50290

Summary

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

Severity

medium

EPSS

0.4% (p29)

CWE

CWE-79

Also known as

GHSA-93q6-wwjh-jc6h

Published

2026-07-02

Updated

2026-07-02

Advisory details

Finding

Location: core/src/server/render-to-string.ts:307-311

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().

Mitigating Factor: These CSS injection vectors only work in legacy browsers (IE6-IE10). SpecifyJS targets modern browsers.

Status

Fixed in v0.2.136 — CSS sanitization now normalizes unicode escapes and strips CSS comments before pattern matching. Also checks for behavior:, -moz-binding, and -o-link patterns.

References

• https://github.com/advisories/GHSA-93q6-wwjh-jc6h
• https://github.com/asymmetric-effort/specifyjs/security/advisories/GHSA-93q6-wwjh-jc6h
• https://github.com/asymmetric-effort/specifyjs/commit/25d1fb491d99479efdf501f5f75e0bb80c908f0a

Related advisories

• CVE-2026-50288 — high · npm/@asymmetric-effort/specifyjs
• GHSA-j5qp-p44g-2m49 — medium · npm/@asymmetric-effort/specifyjs
• GHSA-2944-57xv-2682 — medium · npm/@asymmetric-effort/specifyjs
• GHSA-xw57-23p8-9wc5 — medium · npm/@asymmetric-effort/specifyjs
• GHSA-qcr8-x557-7cp3 — medium · npm/@asymmetric-effort/specifyjs
• GHSA-5c7w-4wm3-85vw — medium · npm/@asymmetric-effort/specifyjs
• CVE-2026-85061 — critical · npm/maplibre-gl
• CVE-2026-52881 — critical · Packagist/mantisbt/mantisbt

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