CVE-2024-8536Public exploitNetwork attack vector

Contributor-level stored XSS via unescaped block attribute

Published Sep 30, 2024 · Updated Oct 1, 2024

Stored XSS in Ultimate Blocks before 3.2.2 allows remote authenticated users to execute script through crafted Expand block attributes. The Expand Portion block writes its attacker-controlled displayType attribute into frontend markup without validation or output escaping. Contributor-level access is required to save or submit the block, and the script executes when another user views the rendered content and hovers over the affected text.

CVSS severity5.4
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Ultimate Blocks before 3.2.2 allows remote authenticated users to execute script through crafted Expand block attributes. The Expand Portion block writes its attacker-controlled displayType attribute into frontend markup without validation or output escaping. Contributor-level access is required to save or submit the block, and the script executes when another user views the rendered content and hovers over the affected text.

The record

CVE
CVE-2024-8536
Published
Sep 30, 2024
Updated
Oct 1, 2024
Vendor
Ultimate Blocks
Product
Ultimate Blocks
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 30, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2024Record 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=0 <3.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ultimate Blocks · Ultimate Blocksversion=0 <3.2.2

Published CVSS scores

5.4CISA ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

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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