What’s Vulnerable › Vulnerabilities

CVE-2020-11888

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-04-20 · updated 2026-06-17
• Weakness: CWE-79

Description

python-markdown2 through 2.3.8 allows XSS because element names are mishandled unless a \w+ match succeeds. For example, an attack might use elementname@ or elementname- with an onclick attribute.

Affected products

• python-markdown2: through 2.3.8

References

• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00031.html
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00035.html
• https://github.com/trentm/python-markdown2/issues/348
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XOAIRJJCZNJUALXDHSIGH5PS2H63A3J/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AQLRBGRVRRZK7P5SFL2MNGXFX37YHJAV/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN6QSHRFZXRQAYZJQ4MOW5MKIXBYOMED/
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00031.html
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00035.html
• https://github.com/trentm/python-markdown2/issues/348
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XOAIRJJCZNJUALXDHSIGH5PS2H63A3J/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AQLRBGRVRRZK7P5SFL2MNGXFX37YHJAV/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN6QSHRFZXRQAYZJQ4MOW5MKIXBYOMED/

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