How severe is CVE-2020-28339?

CVE-2020-28339 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-28339 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28339?

CVE-2020-28339 affects Welcart Welcart E-commerce. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-28339?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-28339 published?

CVE-2020-28339 was published on 2020-11-07 and last updated on 2026-06-17.

CVE-2020-28339

CVE-2020-28339 is a high-severity vulnerability in Welcart Welcart E-commerce with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 6.5
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Welcart Welcart E-commerce
Published: 2020-11-07
Last modified: 2026-06-17

Description

The usc-e-shop (aka Collne Welcart e-Commerce) plugin before 1.9.36 for WordPress allows Object Injection because of usces_unserialize. There is not a complete POP chain.

Frequently asked questions

What is CVE-2020-28339?: The usc-e-shop (aka Collne Welcart e-Commerce) plugin before 1.9.36 for WordPress allows Object Injection because of usces_unserialize. There is not a complete POP chain.
How severe is CVE-2020-28339?: CVE-2020-28339 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-28339 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28339?: CVE-2020-28339 affects Welcart Welcart E-commerce. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-28339?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-28339 published?: CVE-2020-28339 was published on 2020-11-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:welcart:welcart_e-commerce:*:*:*:*:*:wordpress:*:*

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