CVE-2020-7679
Prototype Pollution
In all versions of package casperjs, the mergeObjects utility function is susceptible to Prototype Pollution.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Prototype Pollution
In all versions of package casperjs, the mergeObjects utility function is susceptible to Prototype Pollution.
- Record
CVE-2020-7679- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-1207
In all versions of package casperjs, the mergeObjects utility function is susceptible to Prototype Pollution.
- Record
EUVD-2021-1207- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vrr3-5r3v-7xfw
Improperly Controlled Modification of Dynamically-Determined Object Attributes in casperjs
Overview
casperjs is a navigation scripting & testing utility for PhantomJS and SlimerJS.
Affected versions of this package are vulnerable to Prototype Pollution via the mergeObjects utility function.
PoC
var payload = JSON.parse('{"__proto__": {"a": "pwned"}}');
mergeObjects({}, payload);
console.log({}.a); // prints "pwned"
- Record
GHSA-vrr3-5r3v-7xfw- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-915, CWE-1321
- Updated
- 2026-11-02
NVD
In all versions of package casperjs, the mergeObjects utility function is susceptible to Prototype Pollution.
- Record
CVE-2020-7679- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-1321
- Updated
- 2026-11-02
OSVGHSA-vrr3-5r3v-7xfw
Improperly Controlled Modification of Dynamically-Determined Object Attributes in casperjs
Overview
casperjs is a navigation scripting & testing utility for PhantomJS and SlimerJS.
Affected versions of this package are vulnerable to Prototype Pollution via the mergeObjects utility function.
PoC
var payload = JSON.parse('{"__proto__": {"a": "pwned"}}');
mergeObjects({}, payload);
console.log({}.a); // prints "pwned"
- Record
GHSA-vrr3-5r3v-7xfw- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-1321, CWE-915
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
casperjsnpm |
through 1.1.4 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-7679 is a high vulnerability (CVSS 7.3) in Casperjs, published June 19, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.01%, the 80th percentile. No source names a fixed version.