CVE-2021-4017

Cross-Site Request Forgery (CSRF) in star7th/showdoc

7.3 HighFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: None

Exploit likelihood

0.62%Unchanged since Dec 2, 2021

What each source reports

CVE List Score used 7.3

Cross-Site Request Forgery (CSRF) in star7th/showdoc

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

Record: CVE-2021-4017
CVSS 3.0: 7.3 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Weakness: CWE-352
Updated: 2026-11-02

EUVDEUVD-2021-2509 7.3

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

Record: EUVD-2021-2509
CVSS 3.0: 7.3 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-f77h-m9w2-vvg2 8.8

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

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

Record: GHSA-f77h-m9w2-vvg2
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-352
Updated: 2026-11-02

NVD 8.8

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

Record: CVE-2021-4017
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 3.0: 7.3 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
CVSS 2.0: 6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness: CWE-352
Updated: 2026-11-02

OSV 8.8

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

Record: CVE-2021-4017
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-f77h-m9w2-vvg2 8.8

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

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

Record: GHSA-f77h-m9w2-vvg2
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-352
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`showdoc/showdoc` Packagist	before 2.9.13	2.9.13
`showdoc/showdoc` Packagist	before 2.9.13, plus listed versions v1.0.0v1.0.1v1.0.2v1.0.3v1.0.4 Show 45 moreShow less v1.0.5v1.1.0v1.1.1v1.1.3v1.1.4v1.1.5v1.2.0v1.2.1v1.2.2v1.2.3v1.2.4v1.2.5v1.2.6v1.3.0v1.3.1v1.3.3v1.3.4v1.3.5v1.3.6v1.3.7v1.3.8v1.4.0v1.4.1v1.4.2v1.4.3v1.4.4v1.4.5v1.4.6v1.4.7v1.5.0v1.5.1v1.5.2v1.5.3v1.6.0v1.6.1v1.6.2v1.7.0v1.7.1v1.7.2v1.8.0v1.8.1v1.8.2v1.8.3v1.8.4v1.8.5	2.9.13

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-4017 is a high vulnerability (CVSS 7.3) in Showdoc, published December 1, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 49th percentile. Fixed in showdoc/showdoc 2.9.13.

References

This page doesn't list everything

Left out here: 80 versions. The JSON record has them.