How severe is CVE-2018-20962?

CVE-2018-20962 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2018-20962?

CVE-2018-20962 affects the following packages: backpack/crud (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2018-20962?

Update backpack/crud to 3.4.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-20962 is resolved across your whole dependency graph.

How do I detect CVE-2018-20962 in my Packagist dependencies?

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

How do I mitigate CVE-2018-20962 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2018-20962 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2018-20962, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2018-20962?

CVE-2018-20962 has an EPSS (Exploit Prediction Scoring System) score of 1.3%, placing it in the 71th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2018-20962?

CVE-2018-20962 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2018-20962 published, and has it been updated?

CVE-2018-20962 was published on August 8, 2019 and was last updated on October 20, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

MEDIUM severity

CVE-2018-20962 — crud

MEDIUMFix: Laravel-Backpack/CRUD@8b6bd0a

CVE-2018-20962 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in backpack/crud. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for backpack/crud — see the affected versions and patch details below.

Backpack\CRUD for Laravel XSS Vulnerability

Also known asGHSA-6gfm-gpr3-8wh9

Published

Aug 8, 2019

Updated

Oct 20, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

Exploitation data as of Nov 3, 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 CVEs71th percentile — riskier than 71% of all scored CVEsHighest risk

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

🐘backpack/crud

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

The Backpack\CRUD Backpack component before 3.4.9 for Laravel allows XSS via the select field type.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`backpack/crud`	all versions	3.4.9`composer require backpack/crud:^3.4.9`

Affected Products

1 product · 1 configurations

Application

backpack\\crudbackpackforlaravel

< 3.4.9

range

Exploits & PoCs

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

The Backpack\CRUD Backpack component before 3.4.9 for Laravel allows XSS…

github.comNVDAug 2019

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for backpack/crud, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update backpack/crud to 3.4.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-20962 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

The Backpack\CRUD Backpack component before 3.4.9 for Laravel allows XSS via the select field type.

O3 Security · Impact-Aware SCA

Is CVE-2018-20962 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

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

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template or Metasploit module yet. 1 public proof-of-concept reference is listed on this page.

OpenSSF Scorecard

Package health score

CRUD

5.9/10

Maintained10/10

Code-Review1/10

Branch-ProtectionN/A

Assessed Nov 2, 2026

Timeline

Disclosed

Aug 8, 2019

First exploit

Aug 15, 2019

7 days after disclosure — rapid exploitation

Last updated

Oct 20, 2026

Identifiers

CVE-2018-20962

GHSA-6gfm-gpr3-8wh9

References

Advisorygithub.com · CHANGELOG.md Advisorynvd.nist.gov · CVE 2018 20962 Fixgithub.com · 8b6bd0a2d489a4690f6b1d7ace67e2f07f5f0cc6 Fixgithub.com · 3.4.8...3.4.9 Reportgithub.com Webgithub.com · CHANGELOG.md Packagegithub.com · CRUD

Related vulnerabilities

This CVE is medium severity; 8 of 8 other CVEs affecting backpack/crud are rated as high or higher (top: high).

CVE-2026-57570CVE-2026-54179CVE-2026-54177CVE-2026-54178CVE-2026-54176CVE-2026-54181CVE-2026-54182CVE-2026-54180

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 20, 2026