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Fencer Vulns
high 7.5

CVE-2020-24939 json

Prototype pollution in supermixer

published 2021-06-16 5 y ago modified 2026-06-17 4 mo ago also GHSA-7prf-vw4p-qr59 , EUVD-2021-2471

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

Prototype pollution in Stampit supermixer 1.0.3 allows an attacker to modify the prototype of a base object which can vary in severity depending on the implementation.

Patch / fix

  • npm supermixer 1.0.5

Exploit prediction

1.70% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/959987 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/stampit-org/supermixer/issues/9 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
npm supermixer
<1.0.5
1.0.5

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.