What is CVE-2021-3683?

CVE-2021-3683 is a medium-severity vulnerability in Showdoc, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2021-11-13.

How severe is CVE-2021-3683?

Medium severity. CVSS v3 base score is 6.5 out of 10.

CSRF in Showdoc

CVE-2021-3683

showdoc is vulnerable to Cross-Site Request Forgery (CSRF)

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-11-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (33.1th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Showdoc
Star7th Star7th/showdoc — versions unspecified

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

github.com/star7th/showdoc/commit/67093c879a6563aa6ee08003177777d1975e2351 (Patch, Third Party Advisory)
huntr.dev/bounties/063a339a-5d78-40d6-a96a-6716960e8134 (Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3683?: CVE-2021-3683 is a medium-severity vulnerability in Showdoc, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2021-11-13.
How severe is CVE-2021-3683?: Medium severity. CVSS v3 base score is 6.5 out of 10.