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CVE-2021-3776

20
FAUCET Score

CVE-2021-3776 describes a Cross-Site Request Forgery (CSRF) vulnerability affecting the showdoc application. This medium-severity flaw (CVSS 5.4) has a network attack vector and low attack complexity, requiring user interaction but potentially leading to limited confidentiality and integrity impacts. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.9.12CPE matchmatch criteria
cpe:2.3:a:showdoc:showdoc:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

4.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.40%
Probability of exploitation in next 30 days
EPSS Percentile
32.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0040 is in the 34th percentile among its peer group of 26,236 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 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-m4hj-wg2r-qpcrmedium

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

Nov 15, 2021

References

github.com / star7th/showdoc/commit/67093c879a6563aa6ee08003177777d1975e2351
PatchThird Party Advisory
huntr.dev / bounties/e0edf27d-437e-44fe-907a-df020f385304
ExploitPatchThird Party Advisory