Cross-Site Scripting in bootstrap-select

Answer in brief

CVE-2019-20921 records a Unknown severity vulnerability in Cross-Site Scripting in bootstrap-select. The current sources do not mark it as known exploited. The current feed maps bootstrap-select (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 3, 2020Updated Sep 10, 2026Source checked Sep 10, 2026First seen by HOL Sep 10, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps bootstrap-select (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
bootstrap-selectnpm	>=0 <1.13.6	1.13.6

Recommended response

Check inventory. Check lockfiles and deployed manifests for bootstrap-select.
Review the reported fix. Update bootstrap-select to 1.13.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 3, 2020
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Sep 10, 2026

Sources and claim methodology

Upstream source description

Versions of `bootstrap-select` prior to 1.13.6 are vulnerable to Cross-Site Scripting (XSS). The package does not escape `title` values on `<option>` tags. This may allow attackers to execute arbitrary JavaScript in a victim's browser. ## Recommendation Upgrade to version 1.13.6 or later.

Quoted source text, attributed separately from HOL analysis.