CVE-2020-5259
Prototype Pollution in Dojox
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
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 High
CVSS: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 High
CVSS: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 High
CVSS: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 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N - CVSS 3.1
- 8.6 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N - CVSS 2.0
- 5.0 Medium
AV: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 High
CVSS: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 High
CVSS: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 High
CVSS: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 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N - CVSS 3.1
- 8.6 High
CVSS: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
| Package | Affected | Fixed |
|---|---|---|
dojoxnpm |
before 1.11.10 | 1.11.10 |
dojoxnpm |
1.12.0 up to 1.12.8 | 1.12.8 |
dojoxnpm |
1.13.0 up to 1.13.7 | 1.13.7 |
dojoxnpm |
1.14.0 up to 1.14.6 | 1.14.6 |
dojoxnpm |
1.15.0 up to 1.15.3 | 1.15.3 |
dojoxnpm |
1.16.0 up to 1.16.2 | 1.16.2 |
dojoDebian:12 |
before 1.15.3+dfsg1-1 | 1.15.3+dfsg1-1 |
dojoDebian:13 |
before 1.15.3+dfsg1-1 | 1.15.3+dfsg1-1 |
dojoDebian:14 |
before 1.15.3+dfsg1-1 | 1.15.3+dfsg1-1 |
dojoDebian: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 |
Show 4 moreShow less
| Package | Affected | Fixed |
|---|---|---|
dojoMageia:7 |
before 1.14.6-1.mga7 | 1.14.6-1.mga7 |
dojoUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 1.10.4+dfsg-21.10.4+dfsg-2ubuntu0.1~esm1 |
None known |
dojoUbuntu:18.04:LTS |
All versions, plus listed versions 1.11.0+dfsg-1 |
None known |
dojoUbuntu: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
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD, OSV |
References
github.com/dojo/dojox/security/advisories/GHSA-3hw5-q855-g6cw
github.com/dojo/dojox/commit/47d1b302b5b23d94e875b77b9b9a8c4f5622c9da
lists.debian.org/debian-lts-announce/2020/03/msg00012.html
nvd.nist.gov/vuln/detail/CVE-2020-5259
github.com/advisories/GHSA-3hw5-q855-g6cw
security-tracker.debian.org/tracker/CVE-2020-5259