Cross-site Scripting in Prism
Impact
Prism's Command line plugin can be used by attackers to achieve an XSS attack. The Command line plugin did not properly escape its output, leading to the input text being inserted into the DOM as HTML code.
Server-side usage of Prism is not impacted. Websites that do not use the Command Line plugin are also not impacted.
Patches
This bug has been fixed in v1.27.0.
Workarounds
Do not use the Command line plugin on untrusted inputs, or sanitized all code blocks (remove all HTML code text) from all code blocks that use the Command line plugin.
References
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | prismjs | >= 1.14.0, < 1.27.0 | 1.27.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:L- Weakness (CWE)
CWE-79- Platform
- npm
- Package
prismjs- Disclosed
- 22.02.2022
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-3949-f494-cm99 - CC BY 4.0
Vulnerability history: prismjs
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
- 6
- First → latest
- 08.2020 03.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 2
Disclosures per year
- 2020: 1
- 2021: 3
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 1
- 2026: 0
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