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MEDIUM severity

CVE-2018-19621 — showdoc

MEDIUM

CVE-2018-19621 is a medium-severity (CVSS 6.5) Cross-Site Request Forgery (CSRF) vulnerability in showdoc/showdoc. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Showdoc CSRF Vulnerability

Also known asGHSA-3p87-gqw8-4pf2
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs39th percentile — riskier than 39% of all scored CVEsHighest risk
0.00%0.32%0.63%0.95%0.1%0.4%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘showdoc/showdoc

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

server/index.php?s=/api/teamMember/save in ShowDoc 2.4.2 has a CSRF that can add members to a team.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐘Packagistshowdoc/showdocall versionsNo fix

Affected Products

1 product · 1 configurations
Application
showdocshowdoc
1 version
2.4.2
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

server/index.php?s=/api/teamMember/save in ShowDoc 2.4.2 has a CSRF that…

github.comNVDDec 2018

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for showdoc/showdoc, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of showdoc/showdoc for CVE-2018-19621. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

server/index.php?s=/api/teamMember/save in ShowDoc 2.4.2 has a CSRF that can add members to a team.
O3 Security · Impact-Aware SCA

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CVE-2018-19621: showdoc: Showdoc CSRF Vulnerability