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Cross-Site Scripting in Prism

High severity GitHub Reviewed Published Aug 6, 2020 in PrismJS/prism • Updated Jan 9, 2023

Package

npm prismjs (npm)

Affected versions

>= 1.1.0, < 1.21.0

Patched versions

1.21.0

Description

Impact

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).

Patches

This problem is patched in v1.21.0.

Workarounds

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.

References

The vulnerability was introduced by this commit on Sep 29, 2015 and fixed by Masato Kinugawa (#2506).

For more information

If you have any questions or comments about this advisory, please open an issue.

References

@RunDevelopment RunDevelopment published to PrismJS/prism Aug 6, 2020
Reviewed Aug 7, 2020
Published to the GitHub Advisory Database Aug 7, 2020
Last updated Jan 9, 2023

Severity

High
7.1
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L

Weaknesses

CVE ID

CVE-2020-15138

GHSA ID

GHSA-wvhm-4hhf-97x9

Source code

No known source code

Credits

Checking history
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