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MEDIUM severity

CVE-2018-19620 — showdoc

MEDIUMFix: star7th/showdoc@bcdb5e3

CVE-2018-19620 is a medium-severity (CVSS 4.3) CWE-425 vulnerability in showdoc/showdoc. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for showdoc/showdoc — see the affected versions and patch details below.

Showdoc Unauthenticated Access

Also known asGHSA-pfrc-5hhq-6hvr
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs70th percentile — riskier than 70% of all scored CVEsHighest risk
0.00%0.59%1.17%1.76%0.1%1.3%May 26Sep 26Nov 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

ShowDoc 2.4.1 allows remote attackers to edit other users' notes by navigating with a modified page_id.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistshowdoc/showdocall versions2.4.2composer require showdoc/showdoc:^2.4.2

Affected Products

1 product · 1 configurations
Application
showdocshowdoc
1 version
2.4.1
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.

ShowDoc 2.4.1 allows remote attackers to edit other users' notes by navi…

github.comNVDOct 2019

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. Fix

    Update showdoc/showdoc to 2.4.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-19620 is resolved across your whole dependency graph.

  3. Workarounds

    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

ShowDoc 2.4.1 allows remote attackers to edit other users' notes by navigating with a modified page_id.
O3 Security · Impact-Aware SCA

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CVE-2018-19620: showdoc — Fixed in 2.4.2