How severe is CVE-2020-7642?

CVE-2020-7642 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-7642 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-7642?

CVE-2020-7642 affects Lazysizes Project Lazysizes. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-7642?

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

When was CVE-2020-7642 published?

CVE-2020-7642 was published on 2020-04-22 and last updated on 2026-06-17.

CVE-2020-7642

CVE-2020-7642 is a medium-severity vulnerability in Lazysizes Project Lazysizes with a CVSS 3.x base score of 5.4. 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 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Lazysizes Project Lazysizes
Published: 2020-04-22
Last modified: 2026-06-17

Description

lazysizes through 5.2.0 allows execution of malicious JavaScript. The following attributes are not sanitized by the video-embed plugin: data-vimeo, data-vimeoparams, data-youtube and data-ytparams which can be abused to inject malicious JavaScript.

Frequently asked questions

What is CVE-2020-7642?: lazysizes through 5.2.0 allows execution of malicious JavaScript. The following attributes are not sanitized by the video-embed plugin: data-vimeo, data-vimeoparams, data-youtube and data-ytparams which can be abused to inject malicious JavaScript.
How severe is CVE-2020-7642?: CVE-2020-7642 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-7642 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-7642?: CVE-2020-7642 affects Lazysizes Project Lazysizes. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-7642?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-7642 published?: CVE-2020-7642 was published on 2020-04-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lazysizes_project:lazysizes:*:*:*:*:*:*:*:*

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