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CRITICAL severity

CVE-2020-27998 — FastReport.OpenSource

CRITICALFix: FastReports/FastReport#206

CVE-2020-27998 is a critical-severity (CVSS 9.8) CWE-862 vulnerability in FastReport.OpenSource. 1 public exploit reference exists, so weaponization risk is real. A fix is available for FastReport.OpenSource — see the affected versions and patch details below.

Missing Authorization in FastReport

Also known asGHSA-v726-3vg9-cp34
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs83th percentile — riskier than 83% of all scored CVEsHighest risk
0.01%0.97%1.94%2.90%0.6%2.4%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-27998 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
.NETFastReport.OpenSource

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

Description

An issue was discovered in FastReport before 2020.4.0. It lacks a ScriptSecurity feature and therefore may mishandle (for example) GetType, typeof, TypeOf, DllImport, LoadLibrary, and GetProcAddress.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetFastReport.OpenSourceall versions2020.4.0dotnet add package FastReport.OpenSource --version 2020.4.0

Affected Products

1 product · 1 configurations
Application
fastreportfast-report
< 2020.4.0
range
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.

An issue was discovered in FastReport before 2020.4.0. It lacks a Script…

securitylab.github.comNVDJul 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update FastReport.OpenSource to 2020.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-27998 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

An issue was discovered in FastReport before 2020.4.0. It lacks a ScriptSecurity feature and therefore may mishandle (for example) GetType, typeof, TypeOf, DllImport, LoadLibrary, and GetProcAddress.
O3 Security · Impact-Aware SCA

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CVE-2020-27998: FastReport — Fixed in 2020.4.0