How severe is CVE-2020-27851?

CVE-2020-27851 has a CVSS score of 5.4/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2020-27851?

CVE-2020-27851 affects the following packages: wp-premium/gravityforms (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2020-27851?

Update wp-premium/gravityforms to 2.4.21 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-27851 is resolved across your whole dependency graph.

How do I detect CVE-2020-27851 in my Packagist dependencies?

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

How do I mitigate CVE-2020-27851 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-2020-27851 actively exploited in the wild?

No public exploit code has been indexed for CVE-2020-27851 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2020-27851?

CVE-2020-27851 has an EPSS (Exploit Prediction Scoring System) score of 0.8%, placing it in the 54th 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-2020-27851?

CVE-2020-27851 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-2020-27851 published, and has it been updated?

CVE-2020-27851 was published on May 24, 2022 and was last updated on April 24, 2024. 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-2020-27851 — wp-premium/gravityforms

MEDIUM

CVE-2020-27851 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in wp-premium/gravityforms. A fix is available for wp-premium/gravityforms — see the affected versions and patch details below.

Gravity Forms stored HTML injection vulnerability

Published

May 24, 2022

Updated

Apr 24, 2024

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 26, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.8%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs54th percentile — riskier than 54% of all scored CVEsHighest risk

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

How urgent is this, really

CVE-2020-27851 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 379,842 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

🐘wp-premium/gravityforms

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

Multiple stored HTML injection vulnerabilities in the "poll" and "quiz" features in an additional paid add-on of Rocketgenius Gravity Forms before 2.4.21 allows remote attackers to inject arbitrary HTML code via poll or quiz answers. This code is interpreted by users in a privileged role (Administrator, Editor, etc.).

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`wp-premium/gravityforms`	all versions	2.4.21`composer require wp-premium/gravityforms:^2.4.21`

Affected Products

1 product · 1 configurations

Application

gravityformsrocketgenius

< 2.4.21

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for wp-premium/gravityforms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update wp-premium/gravityforms to 2.4.21 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-27851 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

O3 Security · Impact-Aware SCA

Is CVE-2020-27851 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

5.4/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No known public exploit tooling found.

Timeline

Disclosed

May 24, 2022

Last updated

Apr 24, 2024

Identifiers

CVE-2020-27851

References

Advisorynvd.nist.gov Webdigital.security Packagegithub.com

Related vulnerabilities

Also affects wp-premium/gravityforms

This CVE is medium severity; 3 of 3 other CVEs affecting wp-premium/gravityforms are rated as high or higher (top: high).

CVE-2020-13764CVE-2020-27852CVE-2020-27850

Same weakness: CWE-79

This CVE is medium severity; 5 of 5 other CVEs with CWE-79 are rated as high or higher (top: high).

CVE-2026-91127CVE-2026-77606CVE-2026-84992CVE-2026-77608CVE-2026-77607Browse all CWE-79

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedApr 24, 2024