Cross-Site Scripting in nunjucks
Affected versions of nunjucks do not properly escape specially structured user input in template vars when in auto-escape mode, resulting in a cross-site scripting vulnerability.
Proof of Concept
By using an array for the keys in a template var, escaping is bypassed.
name[]=<script>alert(1)</script>A full PoC is available in the references section.
Recommendation
Update to version 2.4.3 or later.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | nunjucks | < 2.4.3 | 2.4.3 |
References
- Weakness (CWE)
CWE-79- Platform
- npm
- Package
nunjucks- Disclosed
- 06.11.2018
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-f7ph-p5rv-phw2 - CC BY 4.0
Vulnerability history: nunjucks
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 11.2018 04.2023
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 2
Disclosures per year
- 2018: 1
- 2019: 0
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 0
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Cross-Site Scripting in nunjucks this entry
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