What is CVE-2026-4929?

CVE-2026-4929 is a medium-severity vulnerability in Drupal Simple Hierarchical Select (Shs), classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-21.

How severe is CVE-2026-4929?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Drupal Simple Hierarchical Select (Shs)

CVE-2026-4929

Simple Hierarchical Select (SHS) for Drupal 7 contains cross-site scripting risk due to improper output escaping of term-derived text. Confirmed affected paths include field formatter output (shs_field_formatter_view) and term-tree child-t…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (8.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Drupal Simple Hierarchical Select (Shs) — versions 7.x-1.0
Simple_hierarchical_select_project Simple_hierarchical_select

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

mlhess@drupal.org (Third Party Advisory, third-party-advisory)
mlhess@drupal.org (Exploit, Third Party Advisory, third-party-advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-4929?: CVE-2026-4929 is a medium-severity vulnerability in Drupal Simple Hierarchical Select (Shs), classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-21.
How severe is CVE-2026-4929?: Medium severity. CVSS v3 base score is 5.4 out of 10.