XSS in Parsedown
CVE-2019-10905
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.015 (73.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/erusev/parsedown/issues/699 (Exploit, Third Party Advisory, Issue Tracking)
- github.com/erusev/parsedown/releases/tag/1.7.2 (Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2019-10905?
- CVE-2019-10905 is a high-severity vulnerability in Parsedown, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2019-04-06.
- How severe is CVE-2019-10905?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2019-10905 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.