CVE-2019-10905

Name: CVE-2019-10905
Creator: NVD / NIST
Published: 2019-04-06T20:29:00.447+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.47%

Last modified Jun 17, 2026

CVE-2019-10905 is a vulnerability of currently unknown severity. Parsedown before 1.7.2, when safe mode is used and HTML markup is disabled, might allow attackers to execute arbitrary JavaScript code if a script (already running on the affected page) executes the contents of any element with a specific class. This occurs because spaces are permitted in code block infostrings, which interferes with the intended behavior of a single class name beginning with the language- substring.. EPSS estimates a 1.47% chance of exploitation in the next 30 days.

Description

Parsedown before 1.7.2, when safe mode is used and HTML markup is disabled, might allow attackers to execute arbitrary JavaScript code if a script (already running on the affected page) executes the contents of any element with a specific class. This occurs because spaces are permitted in code block infostrings, which interferes with the intended behavior of a single class name beginning with the language- substring.

Metrics

EPSS Probability

1.47%

70.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Parsedown	Parsedown	< 1.7.2

References

https://github.com/erusev/parsedown/issues/699Exploit, Issue Tracking, Third Party Advisory
https://github.com/erusev/parsedown/releases/tag/1.7.2Release Notes, Third Party Advisory
https://github.com/erusev/parsedown/issues/699Exploit, Issue Tracking, Third Party Advisory
https://github.com/erusev/parsedown/releases/tag/1.7.2Release Notes, Third Party Advisory

Timeline

Published: Apr 6, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-10905?

How severe is CVE-2019-10905?

Severity scoring for CVE-2019-10905 is pending analysis. The EPSS model estimates a 1.47% probability of exploitation in the next 30 days.

How do I fix CVE-2019-10905?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-10905?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST