CVE-2015-6665: Cross-site scripting (XSS) vulnerability in the Ajax handler in Drupal 7.x before 7.39 and the Ctools module 6

Routine

MEDIUM 4.3MITIGATEDOWNGRADEDOWNGRADE

CVE-2015-6665 is a medium-severity flaw (CVSS 4.3) affecting fedora, drupal, ctools. 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 Ajax handler in Drupal 7.x before 7.39 and the Ctools module 6.x-1.x before 6.x-1.14 for Drupal allows remote attackers to inject arbitrary web script or HTML via vectors involving a whitelisted HTML element, possibly related to the "a" tag.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-79
Published	2015-08-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: chaos tool suite project · drupal · fedoraproject

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

Am I affected?

Timeline

2015-08-24 14:59 UTCPublished CVE record published
2026-06-17 00:31 UTCUpdated Record last modified

fedoraproject fedora MITIGATE

Affected: 21 · 22 · 23

Fixed in: no fixed release known

Safe to downgrade to: a release before 21

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

drupal drupal DOWNGRADE

Affected: 7.0 · 7.0 alpha1 · 7.0 alpha2 · 7.0 alpha3 · 7.0 alpha4 · 7.0 alpha5 · 7.0 alpha6 · 7.0 alpha7

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 7.0 (Debian / Ubuntu)

apt-cache madison drupal sudo apt install drupal=<VERSION_BEFORE_7.0> sudo apt-mark hold drupal

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

dnf --showduplicates list drupal sudo dnf downgrade drupal-<VERSION_BEFORE_7.0> sudo dnf versionlock add drupal

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.

chaos tool suite project ctools DOWNGRADE

Affected: 6.x-1.0 · 6.x-1.0 alpha1 · 6.x-1.0 alpha2 · 6.x-1.0 alpha3 · 6.x-1.0 beta1 · 6.x-1.0 beta2 · 6.x-1.0 beta3 · 6.x-1.0 beta4

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.x-1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 6.x-1.0 (Debian / Ubuntu)

apt-cache madison ctools sudo apt install ctools=<VERSION_BEFORE_6.x-1.0> sudo apt-mark hold ctools

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

dnf --showduplicates list ctools sudo dnf downgrade ctools-<VERSION_BEFORE_6.x-1.0> sudo dnf versionlock add ctools

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-2015-6665?

fedora: mitigate or apply the listed mitigation; drupal: downgrade or apply the listed mitigation; ctools: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-6665 being exploited?

CVE-2015-6665 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-2015-6665 affect?

CVE-2015-6665 affects fedora, drupal, ctools. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in the Ajax handler in Drupal 7.x before 7.39 and the Ctools module 6.x-1.x before 6.x-1.14 for Drupal allows remote attackers to inject arbitrary web script or HTML via vectors involving a whitelist

How urgent is CVE-2015-6665?

Priority 37/100. No elevated risk signals yet.

Software pages

Drupal vulnerabilities

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References

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