CVE-2020-15138

Name: CVE-2020-15138
Creator: NVD / NIST
Published: 2020-08-07T17:15:10.45+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.04%

Last modified Jun 17, 2026

CVE-2020-15138 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Prism is vulnerable to Cross-Site Scripting. The easing preview of the Previewers plugin has an XSS vulnerability that allows attackers to execute arbitrary code in Safari and Internet Explorer. EPSS estimates a 2.04% chance of exploitation in the next 30 days.

Description

Prism is vulnerable to Cross-Site Scripting. The easing preview of the Previewers plugin has an XSS vulnerability that allows attackers to execute arbitrary code in Safari and Internet Explorer. This impacts all Safari and Internet Explorer users of Prism >=v1.1.0 that use the _Previewers_ plugin (>=v1.10.0) or the _Previewer: Easing_ plugin (v1.1.0 to v1.9.0). This problem is fixed in version 1.21.0. To workaround the issue without upgrading, disable the easing preview on all impacted code blocks. You need Prism v1.10.0 or newer to apply this workaround.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:L

EPSS Probability

2.04%

78.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Prismjs	Previewers	>= 1.1.0, < 1.21.0

References

https://github.com/PrismJS/prism/pull/2506/commits/7bd7de05edf71112a3a77f87901a2409c9c5c20cPatch, Third Party Advisory
https://github.com/PrismJS/prism/security/advisories/GHSA-wvhm-4hhf-97x9Third Party Advisory
https://prismjs.com/plugins/previewers/#disabling-a-previewerVendor Advisory
https://github.com/PrismJS/prism/pull/2506/commits/7bd7de05edf71112a3a77f87901a2409c9c5c20cPatch, Third Party Advisory
https://github.com/PrismJS/prism/security/advisories/GHSA-wvhm-4hhf-97x9Third Party Advisory
https://prismjs.com/plugins/previewers/#disabling-a-previewerVendor Advisory

Timeline

Published: Aug 7, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15138?

How severe is CVE-2020-15138?

CVE-2020-15138 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.04% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15138?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-15138?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST