CVE-2021-30134: Php mod/curl Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-f8p3-q834-q9cj
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2021-30134 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Php mod/curl libraries in the Packagist ecosystem. The issue involves php-mod/curl allows cross-site scripting. Remediation is available by upgrading affected packages to version 2.3.2.

CVE-2021-30134 at a Glance

CVE Identifier CVE-2021-30134
GHSA Identifier GHSA-f8p3-q834-q9cj
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Php mod/curl
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.1

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
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-2021-30134

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

php-mod/curl fixed: 2.3.2 
Upgrade php-mod/curl to 2.3.2
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 php-mod/curl

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-30134, inspect your project dependencies for Php mod/curl:

inspect dependencies for php-mod/curl

Analyze the terminal output to locate any version of Php mod/curl in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.3.2), 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 Php mod/curl, 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

php-mod/curl (a wrapper of the PHP cURL extension) before 2.3.2 allows XSS via the `post_file_path_upload.php` key parameter and the POST data to `post_multidimensional.php`.

CVE-2021-30134 Affected Php mod/curl Versions

1 component(s)
Fixed Versions:
2.3.2
Product / Package Ecosystem Affected Versions Fixed Version
php-mod/curl
 Packagist
< 2.3.2
2.3.2

References

NVD — CVE-2021-30134 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-30134
Security Fix Commit FIX COMMIT
https://github.com/php-mod/curl/commit/0bddefe8bbd292065f23dd6e24d2c745c4865cf7
Php mod/curl Source Repository REPOSITORY
https://github.com/php-mod/curl
wpscan.com/vulnerability/0b547... WEB
https://wpscan.com/vulnerability/0b547728-27d2-402e-ae17-90d539344ec7

Frequently Asked Questions

What is CVE-2021-30134?
CVE-2021-30134 is a security vulnerability in Php mod/curl involving php-mod/curl allows Cross-site Scripting under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Php mod/curl versions are affected?
Affected versions include releases prior to 2.3.2 across affected packages: php-mod/curl.
What version fixes CVE-2021-30134?
Upgrading to 2.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is php-mod/curl affected?
Yes, php-mod/curl is affected in releases prior to 2.3.2. Upgrade your dependency to 2.3.2 or later.
What is the CVSS score of CVE-2021-30134?
CVE-2021-30134 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-30134?
CVE-2021-30134 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-2021-30134?
Run the dependency tree command: 'inspect dependencies for php-mod/curl'. 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-f8p3-q834-q9cj",
  "modified" : "2025-04-14T22:13:01Z",
  "published" : "2022-12-26T09:30:26Z",
  "aliases" : [ "CVE-2021-30134" ],
  "summary" : "php-mod/curl allows Cross-site Scripting",
  "details" : "php-mod/curl (a wrapper of the PHP cURL extension) before 2.3.2 allows XSS via the `post_file_path_upload.php` key parameter and the POST data to `post_multidimensional.php`.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "php-mod/curl"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.3.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-30134"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/php-mod/curl/commit/0bddefe8bbd292065f23dd6e24d2c745c4865cf7"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/php-mod/curl"
  }, {
    "type" : "WEB",
    "url" : "https://wpscan.com/vulnerability/0b547728-27d2-402e-ae17-90d539344ec7"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-01-09T19:52:37Z",
    "nvd_published_at" : "2022-12-26T07:15:00Z"
  }
}