Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2021-30134

PHP Curl Class Cross-Site Scripting

Php_curl_class_project, Ht_slider_range_for_amazon_affiliates_project, Qiwi, Teamleade, Ptwooplugins, Shopello_api_project / PHP Curl Class

View live feed Monitor via API Watch CVE-2021-30134
Severity
CVSS 6.1 · Medium
Confidence
High
Exploit status
Exploited in the wild
EPSS
1.3%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-30134 is an unauthenticated vulnerability affecting Php_curl_class_project, Ht_slider_range_for_amazon_affiliates_project, Qiwi, Teamleade, Ptwooplugins, Shopello_api_project PHP Curl Class and 5 other...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.

Who is affected?

Php_curl_class_project, Ht_slider_range_for_amazon_affiliates_project, Qiwi, Teamleade, Ptwooplugins, Shopello_api_project / PHP Curl Class.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

PHP Curl Class Cross-Site Scripting

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.

Published
26 Dec 2022
Exploitation Reported
21 Sep 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
Required

Tags

php nuclei_scanner

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

The Shadowserver

Recorded 21 Sep 2026

A trusted third party reported exploitation.

Proof of concept available

Nuclei Templates

Recorded 12 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
The Shadowserver First 2026-09-21 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-30134.yaml 25 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

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

EPSS

1.3%

Weaknesses

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE-79

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Php-mod/curl Library <2.3.2 - Cross-Site Scripting

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 00:00 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  2. 14:20 UTC

    Public PoC available

    Public proof-of-concept code published

  3. 00:00 UTC

    Nuclei template available

    Scanner coverage available

  4. 00:00 UTC

    CVE published

    Vulnerability disclosed publicly

  5. 00:00 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2021-30134

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2021-30134",
  "confidence": "High",
  "cvss_score": 6.1,
  "cvss_estimated": false,
  "epss_score": 0.01261,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}