CVE-2026-96531Network attack vector

Author-level stored XSS via unescaped block attributes

Published Sep 26, 2026 · Updated Sep 26, 2026

Stored XSS in Themeisle Optimole 4.0.0 through 4.2.12 allows remote authenticated users to execute scripts via video-block attributes. The video-player block renders unrecognized wrapper attributes without escaping them, allowing an Author to store an event-handler attribute. Author-level access is required, and the script runs in the browser of anyone who views the post, including an administrator.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Themeisle Optimole 4.0.0 through 4.2.12 allows remote authenticated users to execute scripts via video-block attributes. The video-player block renders unrecognized wrapper attributes without escaping them, allowing an Author to store an event-handler attribute. Author-level access is required, and the script runs in the browser of anyone who views the post, including an administrator.

The record

CVE
CVE-2026-96531
Published
Sep 26, 2026
Updated
Sep 26, 2026
Vendor
Themeisle
Product
Optimole
Classifications
T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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=4.0.0 <4.2.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Themeisle · Optimoleversion=4.0.0 <4.2.13

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1059.007JavaScript/JScript

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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