Vulnerability · Published May 21, 2026 · Assigned by drupal

CVE-2026-4929Simple Hierarchical Select (Drupal 7) XSS in term-derived output

Medium 5.1

In plain English

A medium-severity cross-site scripting in Simple Hierarchical Select (shs) from Drupal. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 4.0)5.1Medium

Exploit odds (30 days)0.2%top 89.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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-term data generation (shs_term_get_children). Malicious taxonomy term names can be rendered unsafely depending on output context. This affects versions from 7.x-1.0 through (and including) 7.x-1.10.

Affected products (as reported)

Vendor	Product	Versions
Drupal	Simple Hierarchical Select (shs)	7.x-1.0 – before 7.x-1.11

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

References

NES patch branch comparison third-party-advisory
https://d7es.tag1.com/security-advisories/simple-hierarchical-select-moderately-critical-cross-site-scripting third-party-advisory
https://www.herodevs.com/vulnerability-directory/cve-2026-4929?nes-for-drupal-7 exploit