How severe is CVE-2014-2018?

CVE-2014-2018 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2014-2018 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-2018?

CVE-2014-2018 primarily affects Mozilla Thunderbird Esr. In total, 152 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2014-2018?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2014-2018 published?

CVE-2014-2018 was published on 2014-02-17 and last updated on 2026-06-17.

CVE-2014-2018

CVE-2014-2018 is a medium-severity vulnerability in Mozilla Thunderbird Esr with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mozilla Thunderbird Esr
Published: 2014-02-17
Last modified: 2026-06-17

Description

Cross-site scripting (XSS) vulnerability in Mozilla Thunderbird 17.x through 17.0.8, Thunderbird ESR 17.x through 17.0.10, and SeaMonkey before 2.20 allows user-assisted remote attackers to inject arbitrary web script or HTML via an e-mail message containing a data: URL in a (1) OBJECT or (2) EMBED element, a related issue to CVE-2013-6674.

Frequently asked questions

What is CVE-2014-2018?: Cross-site scripting (XSS) vulnerability in Mozilla Thunderbird 17.x through 17.0.8, Thunderbird ESR 17.x through 17.0.10, and SeaMonkey before 2.20 allows user-assisted remote attackers to inject arbitrary web script or HTML via an e-mail message containing a data: URL in a (1) OBJECT or (2) EMBED element, a related issue to CVE-2013-6674.
How severe is CVE-2014-2018?: CVE-2014-2018 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2014-2018 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-2018?: CVE-2014-2018 primarily affects Mozilla Thunderbird Esr. In total, 152 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2014-2018?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2014-2018 published?: CVE-2014-2018 was published on 2014-02-17 and last updated on 2026-06-17.

References

Affected products (152)

cpe:2.3:a:mozilla:thunderbird_esr:17.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.6:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.7:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.8:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.10:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.6:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.7:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.8:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0:alpha:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0:beta:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0.6:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0.7:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0.8:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.0.9:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1:alpha:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1:beta:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.5:*:*:*:*:*:*:*

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