CVE-2020-19947: Cross Site Scripting vulnerability found in Markdown Edit allows a remote attacker to execute arbitrary code v

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CRITICAL 9.6MITIGATE

CVE-2020-19947 is a critical-severity flaw (CVSS 9.6) affecting markdown edit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting vulnerability found in Markdown Edit allows a remote attacker to execute arbitrary code via the edit parameter of the webpage.

Why this priority

Critical severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 39%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-03-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: markdown edit project

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

Am I affected?

Timeline

2023-03-16 15:15 UTCPublished CVE record published
2026-06-17 03:00 UTCUpdated Record last modified

markdown edit project markdown edit MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy markdown-edit || rpm -q markdown-edit || markdown-edit --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2020-19947?

markdown edit: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-19947 being exploited?

CVE-2020-19947 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-2020-19947 affect?

CVE-2020-19947 affects markdown edit. Severity is critical (CVSS 9.6). Cross Site Scripting vulnerability found in Markdown Edit allows a remote attacker to execute arbitrary code via the edit parameter of the webpage.

How urgent is CVE-2020-19947?

Priority 54/100. Critical severity; Public exploit reference

References

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