CVE-2021-23342: This affects the package docsify before 4.12.0

Q: How do I fix CVE-2021-23342?

docsify: upgrade to 4.12.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-23342 being exploited?

CVE-2021-23342 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-23342 affect?

CVE-2021-23342 affects docsify. Severity is high (CVSS 8.6). This affects the package docsify before 4.12.0. It is possible to bypass the remediation done by CVE-2020-7680 and execute malicious JavaScript through the following methods 1) When parsing HTML from remote URLs, the HTML code on the main p

Q: How urgent is CVE-2021-23342?

Priority 59/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.6REMOTEUPGRADE

CVE-2021-23342 is a high-severity flaw (CVSS 8.6) affecting docsify. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This affects the package docsify before 4.12.0. It is possible to bypass the remediation done by CVE-2020-7680 and execute malicious JavaScript through the following methods 1) When parsing HTML from remote URLs, the HTML code on the main page is sanitized, but this sanitization is not taking place in the sidebar. 2) The isURL external check can be bypassed by inserting more “////” characters

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-02-19
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: docsifyjs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-02-19 17:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

docsifyjs docsify UPGRADE

Affected: < 4.12.0

Fixed in: 4.12.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy docsify || rpm -q docsify || docsify --version

2. UPGRADE to 4.12.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade docsify

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade docsify

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-23342?

docsify: upgrade to 4.12.0. Exact commands for each OS are on this page.

Is CVE-2021-23342 being exploited?

CVE-2021-23342 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-23342 affect?

CVE-2021-23342 affects docsify. Severity is high (CVSS 8.6). This affects the package docsify before 4.12.0. It is possible to bypass the remediation done by CVE-2020-7680 and execute malicious JavaScript through the following methods 1) When parsing HTML from remote URLs, the HTML code on the main p

How urgent is CVE-2021-23342?

Priority 59/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-30074 MEDIUM 6.1 DOWNGRADE docsify 4.12.1 is affected by Cross Site Scripting (XSS) because the search component does not appropriately e
CVE-2020-7680 MEDIUM 6.1 UPGRADE docsify prior to 4.11.4 is susceptible to Cross-site Scripting (XSS)

References

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