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CVE-2021-4017

27
FAUCET Score

CVE-2021-4017 describes a Cross-Site Request Forgery (CSRF) vulnerability affecting showdoc. This high-severity flaw, rated 8.8 CVSS, allows unauthenticated attackers to execute arbitrary actions on behalf of authenticated users through a low-complexity attack requiring user interaction, potentially leading to full compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.9.13CPE matchmatch criteria
cpe:2.3:a:showdoc:showdoc:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.3HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.1
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.60%
Probability of exploitation in next 30 days
EPSS Percentile
44.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0060 is in the 46th percentile among its peer group of 14,852 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: 2.9.13
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-f77h-m9w2-vvg2high

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

Dec 3, 2021

References

github.com / star7th/showdoc/commit/654e871a3923e79076818a9a03533fe88222c871
PatchThird Party Advisory
huntr.dev / bounties/1d8439e8-b3f7-40f8-8b30-f9cb05ff2bcd
ExploitPatchThird Party Advisory