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CVE Record

CVE-2023-6938: Oxygen Builder <= 4.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via Custom Field

The Oxygen Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via a custom field in all versions up to, and including, 4.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. NOTE: Version 4.8.1 of the Oxygen Builder plugin for WordPress addresses this vulnerability by implementing an optional filter to provide output escaping for dynamic data. Please see https://oxygenbuilder.com/documentation/other/security/#filtering-dynamic-data for more details.

MediumCVSS 6.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2023-6938 is a stored cross-site scripting issue in the Oxygen Builder WordPress plugin through version 4.8. A contributor-level user could store script content in a custom field that later runs for visitors to the affected page.

Executive priority

Treat this as a moderate WordPress application risk. Prioritize sites with many content contributors or weaker account controls, because successful abuse can affect users who view compromised pages.

Technical view

The vulnerability is CWE-79 caused by insufficient input sanitization and output escaping for custom-field dynamic data in Oxygen Builder <=4.8. It requires authenticated contributor-or-higher access, is network reachable, low complexity, and has CVSS 3.1 score 6.4.

Likely exposure

Exposure is most likely on WordPress sites running Oxygen Builder 4.8 or earlier, especially where contributor accounts are available to contractors, authors, customers, or compromised users.

Exploitation context

The source bundle does not show CISA KEV listing or other cited evidence of active exploitation. Practical risk depends on whether an attacker can obtain contributor-level access and whether privileged users view injected pages.

Researcher notes

Evidence supports an authenticated stored XSS via custom fields in Oxygen Builder <=4.8, addressed in 4.8.1 through optional output escaping for dynamic data. Sources do not provide exploit telemetry, proof-of-concept details, or broader product impact.

Mitigation direction

  • Upgrade Oxygen Builder beyond version 4.8, starting with 4.8.1 or later.
  • Review Oxygen guidance on filtering dynamic data output.
  • Limit contributor-level access to trusted users only.
  • Audit existing custom fields and pages for unexpected script content.

Validation and detection

  • Inventory WordPress sites using Oxygen Builder and record plugin versions.
  • Confirm affected sites are not running Oxygen Builder 4.8 or earlier.
  • Review user roles for unnecessary contributor-or-higher permissions.
  • Check rendered pages using custom-field dynamic data for unsafe script execution risk.
Prepared
Confidence
high
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2023-6938 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A: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
6.4CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N3.12.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.4Medium
CVSS 3.1 vector shape for CVE-2023-6938Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A: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
Oxygen BuilderOxygen Builder0unaffected
Weakness

CWE details

CWE-79

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