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CVE-2020-28339: The usc-e-shop (aka Collne Welcart e-Commerce) plugin before 1.9.36 for WordPress allows Object Injection b...

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.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2020-28339 affects WordPress sites using usc-e-shop, also known as Collne Welcart e-Commerce, before 1.9.36. The plugin could unserialize attacker-controlled objects through usces_unserialize. It is rated high, but the supplied evidence says there was not a complete POP chain, making practical exploitation less direct.

Executive priority

Treat this as a high-priority remediation for WordPress e-commerce properties, especially internet-facing stores. The known exposure condition is straightforward to validate by plugin version, while exploitation evidence is incomplete and does not support claims of active exploitation.

Technical view

The flaw is PHP object injection in usces_unserialize in Welcart e-Commerce before 1.9.36. CVSS 3.1 is 7.5 with network reachability, low privileges, no user interaction, high attack complexity, and high confidentiality, integrity, and availability impact. Sources do not provide a complete gadget chain or exploit path.

Likely exposure

Exposure is limited to WordPress sites running the usc-e-shop or Collne Welcart e-Commerce plugin below version 1.9.36. The CVE source bundle does not identify affected CPEs, deployment counts, or specific vulnerable configurations beyond plugin version.

Exploitation context

The CVE is not listed as KEV in the supplied data, and no cited source in the bundle confirms active exploitation. The vulnerability is remotely reachable by CVSS, requires low privileges, and has high complexity. The missing complete POP chain is an important limiting factor.

Researcher notes

Analysis should stay focused on usces_unserialize and PHP object injection behavior in versions before 1.9.36. The supplied CVE text explicitly notes no complete POP chain, so avoid assuming remote code execution without additional source-backed evidence.

Mitigation direction

  • Upgrade Welcart e-Commerce to version 1.9.36 or later.
  • Check the WordPress plugin changelog and vendor guidance for current remediation notes.
  • Remove or disable the plugin where it is not business-critical.
  • Restrict unnecessary WordPress accounts and plugin access.
  • Prioritize externally reachable e-commerce sites first.

Validation and detection

  • Inventory WordPress sites for usc-e-shop or Welcart e-Commerce.
  • Confirm installed plugin versions are 1.9.36 or later.
  • Review plugin change history against the WordPress developers page.
  • Check logs for unusual authenticated requests around affected plugin functionality.
  • Document any sites where update or removal is delayed.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2020-28339 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:L/S:U/UI:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:L/S:U/UI:N1.65.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2020-28339Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:L/S:U/UI:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.