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CVE Record

CVE-2023-6988: Colibri Page Builder <= 1.0.239 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode

The Colibri Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's extend_builder_render_js shortcode in all versions up to, and including, 1.0.239 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

MediumCVSS 6.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This vulnerability lets a logged-in WordPress user with Contributor or higher privileges store malicious script content through Colibri Page Builder. The script can run when someone visits the affected page. It is not remotely exploitable without an account, but it can expose admin sessions or site users if low-trust authors exist.

Executive priority

Treat this as a moderate-priority WordPress application risk. Prioritize sites with public registration, many content contributors, contractors, or recent account compromise concerns. Patch during the next normal security maintenance window unless untrusted Contributor-level users exist, which raises urgency.

Technical view

CVE-2023-6988 is stored cross-site scripting in Colibri Page Builder through the extend_builder_render_js shortcode. Versions up to and including 1.0.239 insufficiently sanitize user-supplied shortcode attributes and insufficiently escape output. The CVSS 3.1 score is 6.4 with low privileges required, changed scope, and low confidentiality and integrity impact.

Likely exposure

Exposure is likely limited to WordPress sites running Colibri Page Builder version 1.0.239 or older where Contributor-level or higher accounts are available to attackers or untrusted users.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation evidence. Abuse requires authenticated access at Contributor level or above, then a victim visiting an injected page. Stored XSS can matter more on sites with many authors, compromised accounts, or shared editorial workflows.

Researcher notes

The key evidence is Wordfence’s advisory and the WordPress plugin repository references. The source bundle identifies the vulnerable shortcode and root cause but does not provide active exploitation evidence. Avoid assuming broader product impact beyond Colibri Page Builder up to and including 1.0.239.

Mitigation direction

  • Inventory WordPress sites using Colibri Page Builder.
  • Update Colibri Page Builder beyond 1.0.239 when vendor guidance confirms a fixed release.
  • Restrict Contributor and higher roles to trusted users only.
  • Review existing pages using the affected shortcode for suspicious content.
  • Check vendor and WordPress plugin guidance for any additional remediation.

Validation and detection

  • Confirm installed Colibri Page Builder versions across managed WordPress sites.
  • Identify sites with Contributor, Author, Editor, or Administrator accounts outside trusted staff.
  • Search content for extend_builder_render_js shortcode usage.
  • Review recent posts or pages created by low-trust authenticated users.
  • Verify updated plugin code includes appropriate sanitization and output escaping.
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.

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cve · low confidence lookup

CVE-2023-6988 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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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
4Source 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-2023-6988Attack 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
extendthemesColibri Page Builder0unaffected
Weakness

CWE details

CWE-79

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