CVE-2026-66645Network attack vector

Contributor XSS via unsafe TOC HTML rendering

Published Aug 18, 2026 · Updated Aug 18, 2026

Cross-site scripting in WPDeveloper Table Of Contents Block 1.5.0 and earlier lets remote authenticated users inject script via crafted heading text. In src/list.js, ebGenerateTOC concatenates heading-derived link and content values into raw HTML and List renders that string with dangerouslySetInnerHTML; src/frontend.js also prepends anchor markup with item.innerHTML. Contributor-level access to create or edit a post that contains the block is sufficient, and the stored JavaScript executes in other users' browsers when the page is viewed.

CVSS severity6.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in WPDeveloper Table Of Contents Block 1.5.0 and earlier lets remote authenticated users inject script via crafted heading text. In src/list.js, ebGenerateTOC concatenates heading-derived link and content values into raw HTML and List renders that string with dangerouslySetInnerHTML; src/frontend.js also prepends anchor markup with item.innerHTML. Contributor-level access to create or edit a post that contains the block is sufficient, and the stored JavaScript executes in other users' browsers when the page is viewed.

The record

CVE
CVE-2026-66645
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
ReviewX Team
Product
Table Of Content Block
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=1.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ReviewX Team · Table Of Content Blockversion=n/a <=1.5.0

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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