CWE-1321

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Parent: CWE-915 - Improperly Controlled Modification of Dynamically-Determined Object Attributes

The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

539 vulnerabilities with CWE-1321
CVE-2026-35209 HIGH
defu: Prototype pollution via `__proto__` key in defaults argument
CVSS 7.5
CVE-2026-2950 MEDIUM
lodash vulnerable to Prototype Pollution via array path bypass in `_.unset` and `_.omit`
CVSS 6.5
CVE-2026-34221 CRITICAL
MikroORM has Prototype Pollution in Utils.merge
CVSS 9.1
CVE-2026-33994 CRITICAL
Locutus Prototype Pollution due to incomplete fix for CVE-2026-25521
CVSS 9.8
CVE-2026-33993 CRITICAL
Locutus has Prototype Pollution via __proto__ Key Injection in unserialize()
CVSS 9.8
CVE-2026-33916 MEDIUM
Handlebars.js has Prototype Pollution Leading to XSS through Partial Template Injection
CVSS 4.7
CVE-2026-33672 MEDIUM
Picomatch: Method Injection in POSIX Character Classes causes incorrect Glob Matching
CVSS 5.3
CVE-2026-33696 HIGH
n8n Vulnerable to Prototype Pollution in XML & GSuiteAdmin node parameters lead to RCE
CVSS 8.8
CVE-2026-33228 CRITICAL
flatted: Prototype Pollution via parse()
CVSS 9.8
CVE-2026-32701 HIGH
Qwik has array method pollution in FormData processing, allowing type confusion and DoS
CVSS 7.5
CVE-2026-32886 HIGH
Parse Server's Cloud function dispatch crashes server via prototype chain traversal
CVSS 7.5
CVE-2026-32878 HIGH
Parse Server vulnerable to schema poisoning via prototype pollution in deep copy
CVSS 7.5
CVE-2026-31865 MEDIUM
Elysia Cookie Value Prototype Pollution
CVSS 6.5
CVE-2026-27524 MEDIUM
OpenClaw < 2026.2.21 - Prototype Pollution via Debug Override Path
CVSS 4.3
CVE-2026-4239 LOW
Lagom WHMCS Template Datatables prototype pollution
CVSS 3.5
CVE-2026-32621 CRITICAL
Apollo Federation has prototype pollution via incomplete key sanitization
CVSS 9.9
CVE-2026-30226 HIGH
Svelte devalue <=5.6.3 - Deserialization
CVSS 7.5
CVE-2026-30939 HIGH
Parse Server <8.6.13/9.5.1-alpha.2 - DoS
CVSS 7.5
CVE-2026-29063 CRITICAL
Immutable.js <3.8.3/4.3.7/5.1.5 - Prototype Pollution
CVSS 9.8
CVE-2026-28794 CRITICAL
@orpc/client <1.13.6 - Deserialization
CVSS 9.8
CVE-2026-30785 MEDIUM
rustdesk < 1.4.5 - Prototype Pollution and Insufficient Password Hash Effort
CVSS 5.5
CVE-2026-27837 MEDIUM
Dottie 2.0.4-2.0.6 - Prototype Pollution
CVSS 6.3
CVE-2026-2964 MEDIUM
higuma web-audio-recorder-js 0.1/0.1.1 - Prototype Pollution
CVSS 5.0
CVE-2026-27212 HIGH
Swiper 6.5.1-12.1.1 - Prototype Pollution
CVSS 7.8
CVE-2026-26021 CRITICAL
set-in 2.0.1-2.0.4 - Prototype Pollution via Array.prototype
CVSS 9.8
Details
Vulnerabilities 539