CVE-2026-11766Public exploitNetwork attack vector

Subscriber-level stored XSS via decoded textarea entities

Published Jul 6, 2026 · Updated Jul 6, 2026

Stored XSS in Ultimate Member before 2.12.0 allows remote authenticated users to execute JavaScript through custom textarea profile fields. The textarea output filter strips tags before decoding HTML entities, then emits the decoded value without output escaping. Subscriber-level access and a profile form containing a custom textarea with HTML disabled are required; viewing the profile executes the script in the site's origin.

CVSS severity8.0
High
EPSS probability0.41%
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 Member before 2.12.0 allows remote authenticated users to execute JavaScript through custom textarea profile fields. The textarea output filter strips tags before decoding HTML entities, then emits the decoded value without output escaping. Subscriber-level access and a profile form containing a custom textarea with HTML disabled are required; viewing the profile executes the script in the site's origin.

The record

CVE
CVE-2026-11766
Published
Jul 6, 2026
Updated
Jul 6, 2026
Vendor
Ultimate Member Group Ltd
Product
Ultimate Member
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 6, 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=0 <2.12.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ultimate Member Group Ltd · Ultimate Memberversion=0 <2.12.0

Published CVSS scores

8.0CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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