markdown2 is vulnerable to cross-site scripting · CVE-2018-5773 · GitHub Advisory Database · GitHub

markdown2 is vulnerable to cross-site scripting

Moderate severity GitHub Reviewed Published Jul 12, 2018 to the GitHub Advisory Database • Updated Jan 9, 2023

Package

markdown2 (pip)

Affected versions

< 2.3.6

Patched versions

2.3.6

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.

References

Published to the GitHub Advisory Database Jul 12, 2018

Reviewed Jun 16, 2020

Last updated Jan 9, 2023

Severity

Moderate

6.1

/ 10

CVSS base metrics

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N