CVE-2021-40978

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

• CWE-22

• https://github.com/mkdocs/mkdocsThird Party Advisory
• https://github.com/mkdocs/mkdocs/issues/2601Issue Tracking, Third Party Advisory
• https://github.com/nisdn/CVE-2021-40978Exploit, Third Party Advisory
• https://github.com/nisdn/CVE-2021-40978/issues/1Issue Tracking, Third Party Advisory
• https://github.com/mkdocs/mkdocsThird Party Advisory
• https://github.com/mkdocs/mkdocs/issues/2601Issue Tracking, Third Party Advisory
• https://github.com/nisdn/CVE-2021-40978Exploit, Third Party Advisory
• https://github.com/nisdn/CVE-2021-40978/issues/1Issue Tracking, Third Party Advisory

Published

Oct 7, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-4097phpservermon is vulnerable to Improper Neutralization of CRL…5.4
• CVE-2021-40970Cross-site scripting (XSS) vulnerability in templates/instal…6.1
• CVE-2021-40971Cross-site scripting (XSS) vulnerability in templates/instal…6.1
• CVE-2021-40972Cross-site scripting (XSS) vulnerability in templates/instal…6.1
• CVE-2021-40973Cross-site scripting (XSS) vulnerability in templates/instal…6.1
• CVE-2021-40975Cross-site scripting (XSS) vulnerability in application/modu…6.1
• CVE-2021-4098Insufficient data validation in Mojo in Google Chrome prior …7.4
• CVE-2021-40981ASUS ROG Armoury Crate Lite before 4.2.10 allows local users…7.3
• CVE-2021-40985A stack-based buffer under-read in htmldoc before 1.9.12, al…5.5
• CVE-2021-40986A remote arbitrary command execution vulnerability was disco…7.2
• CVE-2021-40987A remote arbitrary command execution vulnerability was disco…7.2
• CVE-2021-40988A remote directory traversal vulnerability was discovered in…7.2