CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:LCVE-2020-15138
High (7.5) in prismjs previewers. EPSS 2.0% chance of exploitation in the next 30 days. Fixed in prismjs 1.21.0.
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.
Severity
- EPSS
- 2.0% chance of exploitation in the next 30 days; higher than 81% of CVEs (scores of 2026-10-31)
- CWE
- CWE-79
- Published
- Modified
- Record from
- the NVD, synced
Affected
- prismjs:previewers
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-wvhm-4hhf-97x9 | npm | prismjs | >=1.1.0 <1.21.0 | 1.21.0 |
References
- https://github.com/PrismJS/prism/pull/2506/commits/7bd7de05edf71112a3a77f87901a2409c9c5c20c
- https://github.com/PrismJS/prism/security/advisories/GHSA-wvhm-4hhf-97x9
- https://prismjs.com/plugins/previewers/#disabling-a-previewer
- https://github.com/PrismJS/prism/pull/2506/commits/7bd7de05edf71112a3a77f87901a2409c9c5c20c
- https://github.com/PrismJS/prism/security/advisories/GHSA-wvhm-4hhf-97x9