CVE-2020-27850: Wp premium/gravityforms Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-wmh7-782f-xfw5
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CVSS 4.8
CWE-79
Published
Advisory Summary

CVE-2020-27850 is a MODERATE (CVSS 4.8) cross-site scripting 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 cross-site scripting (xss) vulnerability. Remediation is available by upgrading affected packages to version 2.4.21.

CVE-2020-27850 at a Glance

CVE Identifier CVE-2020-27850
GHSA Identifier GHSA-wmh7-782f-xfw5
Severity MODERATE
CVSS v3.1 Base Score 4.8
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: 4.8

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
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-2020-27850

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-2020-27850, 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

A stored Cross-Site Scripting (XSS) vulnerability in forms import feature in Rocketgenius Gravity Forms before 2.4.21 allows remote attackers to inject arbitrary web script or HTML via the import of a GF form. This code is interpreted by users in a privileged role (Administrator, Editor, etc.).

CVE-2020-27850 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
< 2.4.21
2.4.21

References

NVD — CVE-2020-27850 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-27850
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-2020-27850.txt

Frequently Asked Questions

What is CVE-2020-27850?
CVE-2020-27850 is a security vulnerability in Wp premium/gravityforms involving Gravity Forms stored Cross-Site Scripting (XSS) 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-2020-27850?
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-2020-27850?
CVE-2020-27850 has a CVSS v3.1 base score of 4.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-27850?
CVE-2020-27850 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-2020-27850?
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-wmh7-782f-xfw5",
  "modified" : "2024-04-24T18:05:35Z",
  "published" : "2022-05-24T17:39:34Z",
  "aliases" : [ "CVE-2020-27850" ],
  "summary" : "Gravity Forms stored Cross-Site Scripting (XSS) vulnerability",
  "details" : "A stored Cross-Site Scripting (XSS) vulnerability in forms import feature in Rocketgenius Gravity Forms before 2.4.21 allows remote attackers to inject arbitrary web script or HTML via the import of a GF form. 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:H/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "wp-premium/gravityforms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.4"
      }, {
        "fixed" : "2.4.21"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-27850"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/wp-premium/gravityforms"
  }, {
    "type" : "WEB",
    "url" : "https://www.digital.security/advisories/cert-ds_advisory_cve-2020-27850.txt"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-24T18:05:35Z",
    "nvd_published_at" : "2021-01-20T04:15:00Z"
  }
}