CVE-2020-27851: Wp premium/gravityforms Gravity Forms Stored HTML Injection Vulnerability

MODERATE
Advisory Identifier: GHSA-fcj2-rxqc-294c
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CVSS 5.4
CWE-79
Published
Advisory Summary

CVE-2020-27851 is a MODERATE (CVSS 5.4) gravity forms stored html injection vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Wp premium/gravityforms libraries in the Packagist ecosystem. The issue involves gravity forms stored html injection vulnerability. Remediation is available by upgrading affected packages to version 2.4.21.

CVE-2020-27851 at a Glance

CVE Identifier CVE-2020-27851
GHSA Identifier GHSA-fcj2-rxqc-294c
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Wp premium/gravityforms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2020-27851

To remediate this vulnerability, upgrade all affected Wp premium/gravityforms dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

wp-premium/gravityforms fixed: 2.4.21 
Upgrade wp-premium/gravityforms to 2.4.21
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for wp-premium/gravityforms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-27851, inspect your project dependencies for Wp premium/gravityforms:

inspect dependencies for wp-premium/gravityforms

Analyze the terminal output to locate any version of Wp premium/gravityforms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.4.21), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Wp premium/gravityforms, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.).

CVE-2020-27851 Affected Wp premium/gravityforms Versions

1 component(s)
Fixed Versions:
2.4.21
Product / Package Ecosystem Affected Versions Fixed Version
wp-premium/gravityforms
 Packagist
< 2.4.21
2.4.21

References

NVD — CVE-2020-27851 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-27851
Wp premium/gravityforms Source Repository REPOSITORY
https://github.com/wp-premium/gravityforms
Wp premium/gravityforms Security Information SECURITY
https://www.digital.security/advisories/cert-ds_advisory_cve-2020-27851.txt

Frequently Asked Questions

What is CVE-2020-27851?
CVE-2020-27851 is a security vulnerability in Wp premium/gravityforms involving Gravity Forms stored HTML injection vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Wp premium/gravityforms versions are affected?
Affected versions include releases prior to 2.4.21 across affected packages: wp-premium/gravityforms.
What version fixes CVE-2020-27851?
Upgrading to 2.4.21 (or the latest patched release for your respective branch) resolves the vulnerability.
Is wp-premium/gravityforms affected?
Yes, wp-premium/gravityforms is affected in releases prior to 2.4.21. Upgrade your dependency to 2.4.21 or later.
What is the CVSS score of CVE-2020-27851?
CVE-2020-27851 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-27851?
CVE-2020-27851 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2020-27851?
Run the dependency tree command: 'inspect dependencies for wp-premium/gravityforms'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fcj2-rxqc-294c",
  "modified" : "2024-04-24T18:05:25Z",
  "published" : "2022-05-24T17:39:34Z",
  "aliases" : [ "CVE-2020-27851" ],
  "summary" : "Gravity Forms stored HTML injection vulnerability",
  "details" : "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.).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "wp-premium/gravityforms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.4.21"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-27851"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/wp-premium/gravityforms"
  }, {
    "type" : "WEB",
    "url" : "https://www.digital.security/advisories/cert-ds_advisory_cve-2020-27851.txt"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-24T18:05:25Z",
    "nvd_published_at" : "2021-01-20T04:15:00Z"
  }
}