Vulnerability record · CVE-2022-21169 · published 26 September 2022

CVE-2022-21169: Express xss sanitizer project express xss sanitizer prototype pollution vulnerability

EExpress Xss Sanitizer Project · Express Xss Sanitizer

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.

6.1 CVSS 3.1 Medium EPSS 0.95% · top 40.2% CWE-1321 · Prototype pollution

6.1CVSS 3.1 base score

0.95%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

8References, 4 tagged exploit

17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

EExpress Xss Sanitizer Express Xss Sanitizer Project

References

Link	Tags
https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/3bf8aaaf4dbb1c209dcb8d87a82711a54c1ab39a	PatchThird Party Advisory
https://github.com/AhmedAdelFahim/express-xss-sanitizer/issues/4	ExploitIssue TrackingThird Party Advisory
https://runkit.com/embed/w306l6zfm7tu	PatchThird Party AdvisoryURL Repurposed
https://security.snyk.io/vuln/SNYK-JS-EXPRESSXSSSANITIZER-3027443	ExploitThird Party Advisory
https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/3bf8aaaf4dbb1c209dcb8d87a82711a54c1ab39a	PatchThird Party Advisory
https://github.com/AhmedAdelFahim/express-xss-sanitizer/issues/4	ExploitIssue TrackingThird Party Advisory
https://runkit.com/embed/w306l6zfm7tu	PatchThird Party AdvisoryURL Repurposed
https://security.snyk.io/vuln/SNYK-JS-EXPRESSXSSSANITIZER-3027443	ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.2CVE-2026-33979Express xss sanitizer project express xss sanitizer cross-site scripting vulnerabilityExpress XSS Sanitizer is Express 4.x and 5.x middleware which sanitizes user input data (in req.body, req.query, req.headers and req.params) to preve…EPSS 0.42%27 Mar 2026 8.6CVE-2026-34621Adobe Acrobat Reader prototype pollution leads to code executionAdobe Acrobat and Reader (versions 24.001.30356, 26.001.21367 and earlier) are affected by prototype pollution (CWE-1321) that can result in arbitrar…KEVEPSS 2.2%analysed11 Apr 2026

Source: NIST National Vulnerability Database (record CVE-2022-21169), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.