CVE-2015-4378: Cross-site scripting (XSS) vulnerability in the Crumbs module 7.x-2.x before 7.x-2.3 for Drupal allows remote

Routine

LOW 2.1DOWNGRADE

CVE-2015-4378 is a low-severity flaw (CVSS 2.1) affecting crumbs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in the Crumbs module 7.x-2.x before 7.x-2.3 for Drupal allows remote authenticated users with the "Administer Crumbs" permission to inject arbitrary web script or HTML via a custom breadcrumb separator.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	2.1 (Low)
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-79
Published	2015-06-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: crumbs project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-06-15 14:59 UTCPublished CVE record published
2026-06-17 00:27 UTCUpdated Record last modified

crumbs project crumbs DOWNGRADE

Affected: 7.x-2.0 · 7.x-2.1 · 7.x-2.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.x-2.0

1. Check installed version

apt-cache policy crumbs || rpm -q crumbs || crumbs --version

2. No fixed release: DOWNGRADE to a release before 7.x-2.0 (Debian / Ubuntu)

apt-cache madison crumbs sudo apt install crumbs=<VERSION_BEFORE_7.x-2.0> sudo apt-mark hold crumbs

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list crumbs sudo dnf downgrade crumbs-<VERSION_BEFORE_7.x-2.0> sudo dnf versionlock add crumbs

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-2015-4378?

crumbs: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-4378 being exploited?

CVE-2015-4378 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-2015-4378 affect?

CVE-2015-4378 affects crumbs. Severity is low (CVSS 2.1). Cross-site scripting (XSS) vulnerability in the Crumbs module 7.x-2.x before 7.x-2.3 for Drupal allows remote authenticated users with the "Administer Crumbs" permission to inject arbitrary web script or HTML via a custom breadcrumb separat

How urgent is CVE-2015-4378?

Priority 23/100. No elevated risk signals yet.

Software pages

Drupal vulnerabilities

References

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