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CVE-2021-4168

28
FAUCET Score

CVE-2021-4168 describes a Cross-Site Request Forgery (CSRF) vulnerability affecting the showdoc application. This high-severity flaw (CVSS 8.8) allows an unauthenticated attacker to trick a logged-in user into performing unintended actions, potentially leading to high impact on confidentiality, integrity, and availability. While no public exploits or active exploitation have been observed, and community discussion is minimal, the vulnerability remains a significant risk if unpatched.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.9.15CPE matchmatch criteria
cpe:2.3:a:showdoc:showdoc:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.3MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.1
Impact Score
4.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.61%
Probability of exploitation in next 30 days
EPSS Percentile
45.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0061 is in the 47th percentile among its peer group of 14,855 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

composerpatch availablevia ghsa
Product: showdoc/showdocFixed in: 2.9.15
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-7vxc-chqj-h83gmedium

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

Jan 6, 2022

References

github.com / star7th/showdoc/commit/3ff0c85d439ccbdfadeb96b5a52acf6318041109
PatchThird Party Advisory
huntr.dev / bounties/f14431e2-f1f6-4331-ba91-a4ea8b26be0c
ExploitIssue TrackingPatchThird Party Advisory