CVE-2018-5773

Name: CVE-2018-5773
Creator: NVD / NIST
Published: 2018-01-18T21:29:00.267+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.83%

Last modified Jun 17, 2026

CVE-2018-5773 is a vulnerability of currently unknown severity. An issue was discovered in markdown2 (aka python-markdown2) through 2.3.5. The safe_mode feature, which is supposed to sanitize user input against XSS, is flawed and does not escape the input properly. EPSS estimates a 0.83% chance of exploitation in the next 30 days.

Description

An issue was discovered in markdown2 (aka python-markdown2) through 2.3.5. The safe_mode feature, which is supposed to sanitize user input against XSS, is flawed and does not escape the input properly. With a crafted payload, XSS can be triggered, as demonstrated by omitting the final '>' character from an IMG tag.

Metrics

EPSS Probability

0.83%

52.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Python-Markdown2 Project	Python-Markdown2	<= 2.3.5

References

https://github.com/trentm/python-markdown2/issues/285Third Party Advisory
https://github.com/trentm/python-markdown2/issues/285Third Party Advisory

Timeline

Published: Jan 18, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-5773?

How severe is CVE-2018-5773?

Severity scoring for CVE-2018-5773 is pending analysis. The EPSS model estimates a 0.83% probability of exploitation in the next 30 days.

How do I fix CVE-2018-5773?

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-2018-5773?

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

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Source: NVD / NIST