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Fencer Intel
high 7.3

CVE-2021-4017 json

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

published 4y ago modified 4mo ago also GHSA-f77h-m9w2-vvg2 , EUVD-2021-2509

cvss
7.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

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

Patch / fix

  • packagist showdoc/showdoc 2.9.13
  • star7th star7th/showdoc v2.9.13

Is CVE-2021-4017 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • huntr.dev https://huntr.dev/bounties/1d8439e8-b3f7-40f8-8b30-f9cb05ff2bcd referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 7.3 CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist showdoc/showdoc
<2.9.13
2.9.13

Affected products

  • star7th star7th/showdoc

Classification

Weakness
  • CWE-352 Cross-Site Request Forgery

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.