CVE-2021-37700
A self Cross-Site Scripting vulnerability exists in the @github/paste-markdown before version 0.3.4.
Does this matter?
Lower severity and a low EPSS score (1.66%). Track it; it rarely justifies an emergency change on its own.
Description
@github/paste-markdown is an npm package for pasting markdown objects. A self Cross-Site Scripting vulnerability exists in the @github/paste-markdown before version 0.3.4. If the clipboard data contains the string `<table>`, a **div** is dynamically created, and the clipboard content is copied into its **innerHTML** property without any sanitization, resulting in improper execution of JavaScript in the browser of the victim (the user who pasted the code). Users directed to copy text from a malicious website and paste it into pages that utilize this library are affected. This is fixed in version 0.3.4. Refer the to the referenced GitHub Advisory for more details including an example exploit.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 1.66% probability · 75th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- paste-markdown project/paste-markdown
- Source
- security-advisories@github.com
References
- https://github.com/github/paste-markdown/commit/32b7ea3f29ae8f256f9d19768387be42678ddf30Patch, Third Party Advisory
- https://github.com/github/paste-markdown/releases/tag/v0.3.4Release Notes, Third Party Advisory
- https://github.com/github/paste-markdown/security/advisories/GHSA-gpfj-4j6g-c4w9Exploit, Third Party Advisory
- https://www.npmjs.com/package/%40github/paste-markdown
- https://github.com/github/paste-markdown/commit/32b7ea3f29ae8f256f9d19768387be42678ddf30Patch, Third Party Advisory
- https://github.com/github/paste-markdown/releases/tag/v0.3.4Release Notes, Third Party Advisory
- https://github.com/github/paste-markdown/security/advisories/GHSA-gpfj-4j6g-c4w9Exploit, Third Party Advisory
- https://www.npmjs.com/package/%40github/paste-markdown
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.