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CVE-2020-5259

Prototype Pollution in Dojox

7.7 HighFix available

CVE-2020-5259 is a high vulnerability (CVSS 7.7) in Dojo Dojox, published March 10, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.02%, the 80th percentile. Fixed in dojox 1.11.10.

In affected versions of dojox (NPM package), the jqMix method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. This has been patched in versions 1.11.10, 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
Low
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

2.02%Up 1.2 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 7.7

Prototype Pollution in Dojox

In affected versions of dojox (NPM package), the jqMix method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. This has been patched in versions 1.11.10, 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

Record
CVE-2020-5259
CVSS 3.1
7.7 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Weakness
CWE-94
Updated
2026-11-02
EUVDEUVD-2020-0326 7.7

In affected versions of dojox (NPM package), the jqMix method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. This has been patched in versions 1.11.10, 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

Record
EUVD-2020-0326
CVSS 3.1
7.7 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-3hw5-q855-g6cw 7.7

Prototype Pollution in Dojox

The Dojox jQuery wrapper jqMix mixin method is vulnerable to Prototype Pollution.

Affected Area:

//https://github.com/dojo/dojox/blob/master/jq.js#L442
		var tobj = {};
		for(var x in props){
			// the "tobj" condition avoid copying properties in "props"
			// inherited from Object.prototype.  For example, if obj has a custom
			// toString() method, don't overwrite it with the toString() method
			// that props inherited from Object.prototype
			if((tobj[x] === undefined || tobj[x] != props[x]) && props[x] !== undefined && obj != props[x]){
				if(dojo.isObject(obj[x]) && dojo.isObject(props[x])){
					if(dojo.isArray(props[x])){
						obj[x] = props[x];
					}else{
						obj[x] = jqMix(obj[x], props[x]);
					}
				}else{
					obj[x] = props[x];
				}
Record
GHSA-3hw5-q855-g6cw
CVSS 3.1
7.7 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Weakness
CWE-94
Updated
2026-11-02
NVD 7.7

In affected versions of dojox (NPM package), the jqMix method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. This has been patched in versions 1.11.10, 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

Record
CVE-2020-5259
CVSS 3.1
7.7 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
CVSS 3.1
8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:P/A:N
Weakness
CWE-94, CWE-74
Updated
2026-11-02
OSV 8.6

In affected versions of dojox (NPM package), the jqMix method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. This has been patched in versions 1.11.10, 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

Record
CVE-2020-5259
CVSS 3.1
8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2020-5259 8.6

In affected versions of dojox (NPM package), the jqMix method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. This has been patched in versions 1.11.10, 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

Record
DEBIAN-CVE-2020-5259
CVSS 3.1
8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Updated
2026-11-02
OSVGHSA-3hw5-q855-g6cw 7.7

Prototype Pollution in Dojox

The Dojox jQuery wrapper jqMix mixin method is vulnerable to Prototype Pollution.

Affected Area:

//https://github.com/dojo/dojox/blob/master/jq.js#L442
		var tobj = {};
		for(var x in props){
			// the "tobj" condition avoid copying properties in "props"
			// inherited from Object.prototype.  For example, if obj has a custom
			// toString() method, don't overwrite it with the toString() method
			// that props inherited from Object.prototype
			if((tobj[x] === undefined || tobj[x] != props[x]) && props[x] !== undefined && obj != props[x]){
				if(dojo.isObject(obj[x]) && dojo.isObject(props[x])){
					if(dojo.isArray(props[x])){
						obj[x] = props[x];
					}else{
						obj[x] = jqMix(obj[x], props[x]);
					}
				}else{
					obj[x] = props[x];
				}
Record
GHSA-3hw5-q855-g6cw
CVSS 3.1
7.7 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Weakness
CWE-94
Updated
2026-11-02
OSVUBUNTU-CVE-2020-5259 7.7

In affected versions of dojox (NPM package), the jqMix method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. This has been patched in versions 1.11.10, 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

Record
UBUNTU-CVE-2020-5259
CVSS 3.1
7.7 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
CVSS 3.1
8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Updated
2026-11-02
OSVMGASA-2020-0232 No score

Updated dojo packages fix security vulnerability

Updated dojo package fixes security vulnerabilities:

In affected versions of dojo, the deepCopy method is vulnerable to prototype Pollution. An attacker could manipulate these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values (CVE-2020-5258).

The Dojox jQuery wrapper jqMix mixin method is vulnerable to Prototype Pollution. An attacker could manipulate these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values (CVE-2020-5259).

Record
MGASA-2020-0232
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
dojox
npm
before 1.11.10
1.11.10
dojox
npm
1.12.0 up to 1.12.8
1.12.8
dojox
npm
1.13.0 up to 1.13.7
1.13.7
dojox
npm
1.14.0 up to 1.14.6
1.14.6
dojox
npm
1.15.0 up to 1.15.3
1.15.3
dojox
npm
1.16.0 up to 1.16.2
1.16.2
dojo
Debian:12
before 1.15.3+dfsg1-1
1.15.3+dfsg1-1
dojo
Debian:13
before 1.15.3+dfsg1-1
1.15.3+dfsg1-1
dojo
Debian:14
before 1.15.3+dfsg1-1
1.15.3+dfsg1-1
dojo
Debian:8
before 1.10.2+dfsg-1+deb8u3, plus listed versions
1.10.2+dfsg-11.10.2+dfsg-1+deb8u11.10.2+dfsg-1+deb8u2
1.10.2+dfsg-1+deb8u3
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Affected packages
PackageAffectedFixed
dojo
Mageia:7
before 1.14.6-1.mga7
1.14.6-1.mga7
dojo
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1.10.4+dfsg-21.10.4+dfsg-2ubuntu0.1~esm1
None known
dojo
Ubuntu:18.04:LTS
All versions, plus listed versions
1.11.0+dfsg-1
None known
dojo
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
1.14.2+dfsg1-11.15.0+dfsg1-11.15.0+dfsg1-1ubuntu0.1~esm1
None known

History

History
WhenChangedSources
2026-11-03aliasesEUVD
2026-11-02createdCVE List, GitHub Advisories, NVD, OSV

References

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