CVE-2024-3241Public exploitNetwork attack vector

Stored XSS via unsanitized Advanced Heading attributes

Published May 14, 2024 · Updated Nov 7, 2024

Stored XSS in Ultimate Blocks before 3.1.7 allows remote authenticated users with Contributor access to inject scripts into posts. The Advanced Heading block renders attacker-controlled level, blockID, and content attributes as markup without validating or escaping them. Contributor-level access is required, and the scripts execute when another user views the injected page, enabling actions in that user's browser context.

CVSS severity5.4
Medium
EPSS probability0.35%
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 3.1.7 allows remote authenticated users with Contributor access to inject scripts into posts. The Advanced Heading block renders attacker-controlled level, blockID, and content attributes as markup without validating or escaping them. Contributor-level access is required, and the scripts execute when another user views the injected page, enabling actions in that user's browser context.

The record

CVE
CVE-2024-3241
Published
May 14, 2024
Updated
Nov 7, 2024
Vendor
Ultimate Blocks
Product
Ultimate Blocks
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 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 <3.1.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ultimate Blocks · Ultimate Blocksversion=0 <3.1.7

Published CVSS scores

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

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

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')
T1059.007JavaScript/JScript

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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