CVE-2026-4929Public exploitNetwork attack vector

Stored XSS via unescaped taxonomy term names

Published May 21, 2026 · Updated May 21, 2026

Stored XSS in Drupal Simple Hierarchical Select 7.x-1.0 through 7.x-1.10 allows remote authenticated users to run browser scripts. shs_field_formatter_view emits term names without escaping in unlinked formatter output, while shs_term_get_children returns raw term names to SHS widget data. Administrative taxonomy-term permissions and a victim viewing affected output are required; scripts run in that viewer's site context.

CVSS severity5.1
Medium
EPSS probability0.21%
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 Simple Hierarchical Select 7.x-1.0 through 7.x-1.10 allows remote authenticated users to run browser scripts. shs_field_formatter_view emits term names without escaping in unlinked formatter output, while shs_term_get_children returns raw term names to SHS widget data. Administrative taxonomy-term permissions and a victim viewing affected output are required; scripts run in that viewer's site context.

The record

CVE
CVE-2026-4929
Published
May 21, 2026
Updated
May 21, 2026
Vendor
Avatar Uploader Project
Product
Simple hierarchical select
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

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-1.0 <7.x-1.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Avatar Uploader Project · Simple hierarchical selectversion=7.x-1.0 <7.x-1.11

Published CVSS scores

5.1Drupal.org CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
5.4NIST NVDCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
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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