Is CVE-2013-6853 being actively exploited?

CVE-2013-6853 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2013-6853?

CVE-2013-6853 has a CVSS 2.0 base score of 4.3 (MEDIUM).

CVE-2013-6853

MEDIUM · CVSS 4.3EPSS 1.9%EU EUVD

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.

Key facts

CVSS score: 4.3 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness (CWE): CWE-79
EPSS score: 1.9% (80th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2013-6655)
Published: January 26, 2014
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2013-6655 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

apple / macos
mozilla / firefox
yahoo / toolbar
yahoo / toolbar

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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