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CVE-2020-35314: A remote code execution vulnerability in the installUpdateThemePluginAction function in index.php in Wonder...

A remote code execution vulnerability in the installUpdateThemePluginAction function in index.php in WonderCMS 3.1.3, allows remote attackers to upload a custom plugin which can contain arbitrary code and obtain a webshell via the theme/plugin installer.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

WonderCMS 3.1.3 had a theme/plugin installer weakness that could let an attacker upload code and gain server execution, described publicly as a path to a webshell. The main business risk is compromise of the website host and any data or credentials reachable from it.

Executive priority

Prioritize remediation for any internet-facing WonderCMS 3.1.3 site. The vulnerability can lead to server code execution, but urgency depends on whether the installer is exposed and whether attacker authentication is required in your deployment.

Technical view

CVE-2020-35314 affects WonderCMS 3.1.3 in index.php's installUpdateThemePluginAction. Public references describe an authenticated remote code execution issue through the theme/plugin installation flow, where a custom plugin can contain arbitrary code. No CVSS score or vendor-fixed version is provided in the supplied bundle.

Likely exposure

Exposure is likely limited to WonderCMS 3.1.3 sites, especially where the administrative theme/plugin installer is reachable. Internet-facing administration, weak credentials, or untrusted administrator access would materially increase risk.

Exploitation context

The supplied sources include public writeups and a Packet Storm entry, but CISA KEV is false and the bundle provides no evidence of active exploitation. Treat this as publicly known and potentially reproducible, not confirmed exploited in the wild.

Researcher notes

The source bundle is thin: no CVSS vector, CWE, CPE, or official fix details are included. The strongest technical detail is the affected function and upload-based plugin execution path. Validate exposure carefully before assuming broad product impact.

Mitigation direction

  • Inventory all WonderCMS deployments and identify any running version 3.1.3.
  • Check WonderCMS vendor or maintainer guidance for fixed versions or upgrade instructions.
  • Restrict administrative and installer access to trusted networks and authorized users.
  • Remove untrusted themes or plugins and investigate unexpected files in web directories.
  • Back up and rebuild affected hosts if webshell activity is suspected.

Validation and detection

  • Confirm whether any production or staging site runs WonderCMS 3.1.3.
  • Verify the theme/plugin installer is not publicly reachable without authorization.
  • Review web server logs for suspicious installer or plugin upload activity.
  • Inspect installed themes and plugins for unauthorized or unexpected code.
  • Confirm remediation by documenting upgraded versions or compensating access controls.
Prepared
Confidence
medium
Sources
5

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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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2020-35314 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

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.