CVE-2026-4929: Simple Hierarchical Select (SHS) for Drupal 7 contains cross-site scripting risk due to improper output escapi

Routine

MEDIUM 5.4UPGRADE

CVE-2026-4929 is a medium-severity flaw (CVSS 5.4) affecting simple hierarchical select. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-05-21
Last modified	2026-07-23

Publisher (CNA): Drupal.org · Vendor: simple hierarchical select project

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-21 22:16 UTCPublished CVE record published
2026-07-23 16:10 UTCUpdated Record last modified

simple hierarchical select project simple hierarchical select UPGRADE

Affected: >= 7.x-1.0 and <= 7.x-1.10

Fixed in: newer than 7.x-1.10

Safe to downgrade to: a release before 7.x-1.0

1. Check installed version

apt-cache policy simple-hierarchical-select || rpm -q simple-hierarchical-select || simple-hierarchical-select --version

2. UPGRADE to newer than 7.x-1.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simple-hierarchical-select

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simple-hierarchical-select

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.x-1.0 (Debian / Ubuntu)

apt-cache madison simple-hierarchical-select sudo apt install simple-hierarchical-select=<VERSION_BEFORE_7.x-1.0> sudo apt-mark hold simple-hierarchical-select

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list simple-hierarchical-select sudo dnf downgrade simple-hierarchical-select-<VERSION_BEFORE_7.x-1.0> sudo dnf versionlock add simple-hierarchical-select

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4929?

simple hierarchical select: upgrade to newer than 7.x-1.10. Exact commands for each OS are on this page.

Is CVE-2026-4929 being exploited?

CVE-2026-4929 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4929 affect?

CVE-2026-4929 affects simple hierarchical select. Severity is medium (CVSS 5.4). 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-te

How urgent is CVE-2026-4929?

Priority 26/100. Public exploit reference

Software pages

Drupal vulnerabilities

References

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