// For flags

CVE-2022-21169

Prototype Pollution

Severity Score

6.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

2
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

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.

El paquete express-xss-sanitizer versiones anteriores a 1.1.3, es vulnerable a una Contaminación de Prototipos por medio del atributo allowedTags, permitiendo al atacante omitir el saneo de tipo xss.

*Credits: Jayateertha Guruprasad
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
Poc
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2022-02-24 CVE Reserved
  • 2022-09-26 CVE Published
  • 2025-05-21 CVE Updated
  • 2025-05-21 First Exploit
  • 2025-05-29 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Express Xss Sanitizer Project
Search vendor "Express Xss Sanitizer Project"
 Express Xss Sanitizer
Search vendor "Express Xss Sanitizer Project" for product "Express Xss Sanitizer"
 < 1.1.3
Search vendor "Express Xss Sanitizer Project" for product "Express Xss Sanitizer" and version " < 1.1.3"
node.js
Affected