What’s Vulnerable › Vulnerabilities

CVE-2018-5773

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-01-18 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• python-markdown2: through 2.3.5

References

• https://github.com/trentm/python-markdown2/issues/285
• https://github.com/trentm/python-markdown2/issues/285

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