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Vulnerabilities

Vulnerability · CVE-2026-50290

SpecifyJS is a declarative TypeScript user interface framework.

Published Aug 21, 2026 · catalog updated Oct 14, 2026 · SpecifyJS is a declarative

Check if you run it

No confirmed exploitation is on record for CVE-2026-50290. EPSS is 0.49%. Act only if a listed version of SpecifyJS is a declarative is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (SpecifyJS is a declarative).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.49%
Remediation
Advisory link
Affected products
See sources for product scope

SpecifyJS is a declarative TypeScript user interface framework. Prior to version 0.2.136, CSS value sanitization stripped and using simple regex, but could be bypassed with CSS unicode escapes ( ), null bytes, or CSS comments ( ). 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 , , and patterns.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-50290

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-50290. EPSS is 0.49%. Act only if a listed version of SpecifyJS is a declarative is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.49%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 21, 2026 · NIST NVD

    Detected

    SpecifyJS is a declarative TypeScript user interface framework. Prior to version 0.2.136, CSS value sanitization stripped and using simple regex, but could be bypassed with CSS unicode escapes ( ), null bytes, or CSS comments ( ). 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 unic

  2. Oct 14, 2026 · NIST NVD

    Updated

    SpecifyJS is a declarative TypeScript user interface framework. Prior to version 0.2.136, CSS value sanitization stripped and using simple regex, but could be bypassed with CSS unicode escapes ( ), null bytes, or CSS comments ( ). 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 unic

Sources

  • CVE.orgVulnerability recordCVE-2026-50290

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-50290

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-50290

    SpecifyJS is a declarative TypeScript user interface framework. Prior to version 0.2.136, CSS value sanitization stripped and using simple regex, but could be bypassed with CSS unicode escapes ( ), null bytes, or CSS comments (`exp/**

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.