What’s Vulnerable › Vulnerabilities

CVE-2021-40978

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 15.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-07 · updated 2026-06-17
• Weakness: CWE-22

Description

The mkdocs 1.2.2 built-in dev-server allows directory traversal using the port 8000, enabling remote exploitation to obtain :sensitive information. NOTE: the vendor has disputed this as described in https://github.com/mkdocs/mkdocs/issues/2601.] and https://github.com/nisdn/CVE-2021-40978/issues/1

Affected products

• Mkdocs: 1.2.2

References

• https://github.com/mkdocs/mkdocs
• https://github.com/mkdocs/mkdocs/issues/2601
• https://github.com/nisdn/CVE-2021-40978
• https://github.com/nisdn/CVE-2021-40978/issues/1
• https://github.com/mkdocs/mkdocs
• https://github.com/mkdocs/mkdocs/issues/2601
• https://github.com/nisdn/CVE-2021-40978
• https://github.com/nisdn/CVE-2021-40978/issues/1

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