CVE-2022-21169
Prototype Pollution
MEDIUM
6.1
CVSS Score
Published: September 26, 2022 at 05:05 AM UTC
Updated: June 17, 2026 at 04:25 AM UTC
1 product affected across 1 vendorExpress Xss Sanitizer
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Severity
MEDIUM6.1
Exploit prediction
EPSS 1.0%
SSVC
PoC
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
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 1.1.3
Affected range stops below 1.1.3, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (4)
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/3bf8aaaf4dbb1c209dcb8d87a82711a54c1ab39ax_refsource_MISCExploitIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/AhmedAdelFahim/express-xss-sanitizer/issues/4x_refsource_MISCPatchThird Party AdvisoryURL Repurposed
Source: [email protected]
https://runkit.com/embed/w306l6zfm7tux_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://security.snyk.io/vuln/SNYK-JS-EXPRESSXSSSANITIZER-3027443SSVC — Action Prioritization
SSVCPoCNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-1321
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