CVE-2013-6853: Cross-site scripting (XSS) vulnerability in clickstream.js in Y! Toolbar plugin for FireFox 3.1.0.201308130241

Routine

MEDIUM 4.3DOWNGRADE

CVE-2013-6853 is a medium-severity flaw (CVSS 4.3) affecting toolbar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in clickstream.js in Y! Toolbar plugin for FireFox 3.1.0.20130813024103 for Mac, and 2.5.9.2013418100420 for Windows, allows remote attackers to inject arbitrary web script or HTML via a crafted URL that is stored by the victim.

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	1.9% (top 20%)
CISA exploited list	No
Weakness	CWE-79
Published	2014-01-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yahoo

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

Am I affected?

Timeline

2014-01-26 01:55 UTCPublished CVE record published
2026-06-17 00:01 UTCUpdated Record last modified

yahoo toolbar DOWNGRADE

Affected: 3.1.0.20130813024103 · 2.5.9.2013418100420

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.5.9.2013418100420

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.5.9.2013418100420 (Debian / Ubuntu)

apt-cache madison toolbar sudo apt install toolbar=<VERSION_BEFORE_2.5.9.2013418100420> sudo apt-mark hold toolbar

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

dnf --showduplicates list toolbar sudo dnf downgrade toolbar-<VERSION_BEFORE_2.5.9.2013418100420> sudo dnf versionlock add toolbar

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-2013-6853?

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

Is CVE-2013-6853 being exploited?

CVE-2013-6853 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-2013-6853 affect?

CVE-2013-6853 affects toolbar. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in clickstream.js in Y! Toolbar plugin for FireFox 3.1.0.20130813024103 for Mac, and 2.5.9.2013418100420 for Windows, allows remote attackers to inject arbitrary web script or HTML via a crafted URL

How urgent is CVE-2013-6853?

Priority 35/100. No elevated risk signals yet.

Software pages

Windows vulnerabilities · Mozilla Firefox vulnerabilities

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References

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