# express-xss-sanitizer (npm) vulnerabilities

Source: https://junglewise.ai/threats/technologies/express-xss-sanitizer  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/express-xss-sanitizer.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 4 vulnerabilities in express-xss-sanitizer (npm): 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-33979, was published on 27 March 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 4 (0 critical, 0 exploited in the wild)

## About express-xss-sanitizer (npm)

npm package providing XSS sanitization middleware for Express.js applications.

## Latest express-xss-sanitizer (npm) vulnerabilities

- [CVE-2026-33979: express-xss-sanitizer configuration bypass leads to permissive HTML sanitization](https://junglewise.ai/threats/cve-2026-33979-ahmedadelfahim-express-xss-sanitizer-permissive-sanitization) (low, CVSS 3.1, published 27 Mar 2026)
- [CVE-2025-59364: express-xss-sanitizer unbounded recursion denial of service](https://junglewise.ai/threats/cve-2025-59364-express-xss-sanitizer-unbounded-recursion-denial-of-service) (medium, CVSS 4, published 26 Sep 2025)
- [express-xss-sanitizer unbounded recursion in sanitize function](https://junglewise.ai/threats/express-xss-sanitizer-unbounded-recursion-in-sanitize-function-e4c60884) (medium, CVSS 4, published 15 Sep 2025)
- [CVE-2022-21169: express-xss-sanitizer prototype pollution bypass in allowedTags](https://junglewise.ai/threats/cve-2022-21169-express-xss-sanitizer-prototype-pollution-bypass-in-allowedtags) (low, CVSS 3.1, published 27 Sep 2022)

## Most severe express-xss-sanitizer (npm) vulnerabilities

- [CVE-2025-59364: express-xss-sanitizer unbounded recursion denial of service](https://junglewise.ai/threats/cve-2025-59364-express-xss-sanitizer-unbounded-recursion-denial-of-service) (medium, CVSS 4, published 26 Sep 2025)
- [express-xss-sanitizer unbounded recursion in sanitize function](https://junglewise.ai/threats/express-xss-sanitizer-unbounded-recursion-in-sanitize-function-e4c60884) (medium, CVSS 4, published 15 Sep 2025)
- [CVE-2022-21169: express-xss-sanitizer prototype pollution bypass in allowedTags](https://junglewise.ai/threats/cve-2022-21169-express-xss-sanitizer-prototype-pollution-bypass-in-allowedtags) (low, CVSS 3.1, published 27 Sep 2022)
- [CVE-2026-33979: express-xss-sanitizer configuration bypass leads to permissive HTML sanitization](https://junglewise.ai/threats/cve-2026-33979-ahmedadelfahim-express-xss-sanitizer-permissive-sanitization) (low, CVSS 3.1, published 27 Mar 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other npm technologies

- [openclaw (npm)](https://junglewise.ai/threats/technologies/npm-openclaw): 214 vulnerabilities
- [flowise (npm)](https://junglewise.ai/threats/technologies/flowise): 133 vulnerabilities
- [parse-server (npm)](https://junglewise.ai/threats/technologies/parse-server): 117 vulnerabilities
- [vm2 (npm)](https://junglewise.ai/threats/technologies/vm2): 111 vulnerabilities
- [electron (npm)](https://junglewise.ai/threats/technologies/electron): 77 vulnerabilities
- [ghost (npm)](https://junglewise.ai/threats/technologies/ghost): 74 vulnerabilities
- [n8n (npm)](https://junglewise.ai/threats/technologies/npm-n8n): 64 vulnerabilities
- [hono (npm)](https://junglewise.ai/threats/technologies/hono): 62 vulnerabilities
- [directus (npm)](https://junglewise.ai/threats/technologies/directus): 61 vulnerabilities
- [nocodb (npm)](https://junglewise.ai/threats/technologies/nocodb): 54 vulnerabilities
- [undici (npm)](https://junglewise.ai/threats/technologies/undici): 53 vulnerabilities
- [@budibase/server (npm)](https://junglewise.ai/threats/technologies/budibase-server): 42 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "express-xss-sanitizer (npm) vulnerabilities", https://junglewise.ai/threats/technologies/express-xss-sanitizer, 13 November 2026.