CVE-2026-2918Network attack vector

Stored XSS via unauthorized template condition update

Published Mar 11, 2026 · Updated Mar 11, 2026

Stored XSS in weDevs Happy Addons for Elementor 3.21.0 and earlier allows remote authenticated users to run script via template conditions. The ha_condition_update action accepts template identifiers after validate_reqeust() checks the general edit_posts capability instead of object-level edit_post authorization, while cond_to_html() concatenates condition values into HTML attributes without escaping. Contributor-level access is enough to alter any published ha_library template, and the injected handler executes when an administrator opens the Template Conditions panel.

CVSS severity6.4
Medium
EPSS probability0.19%
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 weDevs Happy Addons for Elementor 3.21.0 and earlier allows remote authenticated users to run script via template conditions. The ha_condition_update action accepts template identifiers after validate_reqeust() checks the general edit_posts capability instead of object-level edit_post authorization, while cond_to_html() concatenates condition values into HTML attributes without escaping. Contributor-level access is enough to alter any published ha_library template, and the injected handler executes when an administrator opens the Template Conditions panel.

The record

CVE
CVE-2026-2918
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
HappyMonster
Product
Happy Addons for Elementor
Classifications
CWE-639, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 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=* <=3.21.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HappyMonster · Happy Addons for Elementorversion=* <=3.21.0

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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 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-639Authorization Bypass Through User-Controlled Key
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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