hbs vulnerable to XSS via registerAsyncHelper output-escaping bypass
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| hbs | hbs | unaffected |
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No data.
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| Hbs | Hbs |
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No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.402% probability within 30 days)
| Type | Values Removed | Values Added |
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| First Time appeared |
Hbs Project
Hbs Project hbs |
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| CPEs | cpe:2.3:a:hbs_project:hbs:*:*:*:*:*:node.js:*:* | |
| Vendors & Products |
Hbs Project
Hbs Project hbs |
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Hbs
Hbs hbs |
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| Vendors & Products |
Hbs
Hbs hbs |
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| Metrics |
ssvc
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| Description | hbs is an Express view engine that wraps Handlebars. Its registerAsyncHelper API bypasses Handlebars' automatic HTML escaping: an async helper returns an opaque placeholder during the first render pass, so the double-brace expression escapes only the placeholder, and after rendering hbs substitutes the placeholder with the raw callback return value without escaping it, across the cached, uncached, and layout render paths. An application that passes attacker-influenced data, for example user-supplied content from a database, into an async helper callback can therefore have arbitrary HTML and JavaScript injected into the server-rendered page, resulting in stored or reflected cross-site scripting. Versions 2.1.0 through 4.2.1 are affected, and the issue is fixed in 4.3.0, which HTML-escapes async helper output. Applications that intentionally emit raw HTML from an async helper can opt in explicitly with hbs.SafeString. Users should upgrade to 4.3.0. | |
| Title | hbs vulnerable to XSS via registerAsyncHelper output-escaping bypass | |
| Weaknesses | CWE-79 | |
| References |
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| Metrics |
cvssV3_1
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