What’s Vulnerable › Vulnerabilities

CVE-2022-21169: Prototype Pollution

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-09-26 · updated 2026-06-17
• Weakness: CWE-1321

Description

The package express-xss-sanitizer before 1.1.3 are vulnerable to Prototype Pollution via the allowedTags attribute, allowing the attacker to bypass xss sanitization.

Affected products

• express-xss-sanitizer: before 1.1.3 — fixed in 1.1.3

How to fix

Upgrade to a fixed version: express-xss-sanitizer 1.1.3. Check the vendor advisory for mitigations.

References

• https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/3bf8aaaf4dbb1c209dcb8d87a82711a54c1ab39a
• https://github.com/AhmedAdelFahim/express-xss-sanitizer/issues/4
• https://runkit.com/embed/w306l6zfm7tu
• https://security.snyk.io/vuln/SNYK-JS-EXPRESSXSSSANITIZER-3027443
• https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/3bf8aaaf4dbb1c209dcb8d87a82711a54c1ab39a
• https://github.com/AhmedAdelFahim/express-xss-sanitizer/issues/4
• https://runkit.com/embed/w306l6zfm7tu
• https://security.snyk.io/vuln/SNYK-JS-EXPRESSXSSSANITIZER-3027443

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