CVE-2026-4093Public exploitNetwork attack vector

Stored XSS via unsanitized tokens and term labels

Published May 21, 2026 · Updated May 21, 2026

Stored XSS in Drupal 7 Term Reference Tree 7.x-1.x through 7.x-1.11 allows remote authenticated users to run scripts in viewers' browsers. The formatter emits token replacement output without escaping, while the widget renders taxonomy term labels without safe sanitization. Exploitation requires taxonomy-term editing rights and a viewer to load the affected widget or formatter; the token path also requires Token and display templates.

CVSS severity5.1
Medium
EPSS probability0.17%
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 Drupal 7 Term Reference Tree 7.x-1.x through 7.x-1.11 allows remote authenticated users to run scripts in viewers' browsers. The formatter emits token replacement output without escaping, while the widget renders taxonomy term labels without safe sanitization. Exploitation requires taxonomy-term editing rights and a viewer to load the affected widget or formatter; the token path also requires Token and display templates.

The record

CVE
CVE-2026-4093
Published
May 21, 2026
Updated
May 21, 2026
Vendor
Avatar Uploader Project
Product
Taxonomy Term Reference Tree Widget
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2026CVE publishedPublication date reported by the CVE source.
  2. May 21, 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=7.x-1.x <=7.x-1.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Avatar Uploader Project · Taxonomy Term Reference Tree Widgetversion=7.x-1.x <=7.x-1.11

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1Drupal.orgCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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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