Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2021-24219

All Thrive Themes and Plugins - Unauthenticated Option Update

Thrive Themes / Thrive Optimize · affected before 1.4.13.3

Watch CVE-2021-24219 Browse KEV feed
Severity
CVSS 5.3 · Medium
Confidence
High
Exploit status
Exploited in the wild
EPSS
2.1%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-24219 is an unauthenticated All Thrive Themes and Plugins - Unauthenticated Option Update. The Thrive Optimize WordPress plugin before 1.4.13.3, Thrive Comments WordPress plugin before 1.4.15.3, Thrive...

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?

Thrive Themes / Thrive Optimize affected before 1.4.13.3.

What should we do?

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

Overview

All Thrive Themes and Plugins - Unauthenticated Option Update

The Thrive Optimize WordPress plugin before 1.4.13.3, Thrive Comments WordPress plugin before 1.4.15.3, Thrive Headline Optimizer WordPress plugin before 1.3.7.3, Thrive Leads WordPress plugin before 2.3.9.4, Thrive Ultimatum WordPress plugin before 2.3.9.4, Thrive Quiz Builder WordPress plugin before 2.3.9.4, Thrive Apprentice WordPress plugin before 2.3.9.4, Thrive Visual Editor WordPress plugin before 2.6.7.4, Thrive Dashboard WordPress plugin before 2.3.9.3, Thrive Ovation WordPress plugin before 2.4.5, Thrive Clever Widgets WordPress plugin before 1.57.1 and Rise by Thrive Themes WordPress theme before 2.0.0, Ignition by Thrive Themes WordPress theme before 2.0.0, Luxe by Thrive Themes WordPress theme before 2.0.0, FocusBlog by Thrive Themes WordPress theme before 2.0.0, Minus by Thrive Themes WordPress theme before 2.0.0, Squared by Thrive Themes WordPress theme before 2.0.0, Voice WordPress theme before 2.0.0, Performag by Thrive Themes WordPress theme before 2.0.0, Pressive by Thrive Themes WordPress theme before 2.0.0, Storied by Thrive Themes WordPress theme before 2.0.0, Thrive Themes Builder WordPress theme before 2.2.4 register a REST API endpoint associated with Zapier functionality. While this endpoint was intended to require an API key in order to access, it was possible to access it by supplying an empty api_key parameter in vulnerable versions if Zapier was not enabled.

Attackers could use this endpoint to add arbitrary data to a predefined option in the wp_options table.

Thrive Themes Affected
Thrive Optimize
Before 1.4.13.3
Thrive Themes Affected
Thrive Comments
Before 1.4.15.3
Thrive Themes Affected
Thrive Headline Optimizer
Before 1.3.7.3
Thrive Themes Affected
Thrive Leads
Before 2.3.9.4
Thrive Themes Affected
Thrive Ultimatum
Before 2.3.9.4
Thrive Themes Affected
Thrive Quiz Builder
Before 2.3.9.4
Thrive Themes Affected
Thrive Apprentice
Before 2.3.9.4
Thrive Themes Affected
Thrive Visual Editor
Before 2.6.7.4
Thrive Themes Affected
Thrive Dashboard
Before 2.3.9.3
Thrive Themes Affected
Thrive Ovation
Before 2.4.5
Thrive Themes Affected
Thrive Clever Widgets
Before 1.57.1
Thrive Themes Affected
Rise by Thrive Themes
Before 2.0.0
Thrive Themes Affected
Ignition by Thrive Themes
Before 2.0.0
Thrive Themes Affected
Luxe by Thrive Themes
Before 2.0.0
Thrive Themes Affected
FocusBlog by Thrive Themes
Before 2.0.0
Thrive Themes Affected
Minus by Thrive Themes
Before 2.0.0
Thrive Themes Affected
Squared by Thrive Themes
Before 2.0.0
Thrive Themes Affected
Voice
Before 2.0.0
Thrive Themes Affected
Performag by Thrive Themes
Before 2.0.0
Thrive Themes Affected
Pressive by Thrive Themes
Before 2.0.0
Thrive Themes Affected
Storied by Thrive Themes
Before 2.0.0
Thrive Themes Affected
Thrive Themes Builder
Before 2.2.4
Published
12 Apr 2021
Exploitation Reported
24 Mar 2021
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

wordpress 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

Wordfence

Recorded 24 Mar 2021

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.

Learn about Pro API access
Source Added
Wordfence First 2021-03-24 10:36 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-2021-24219.yaml 01 Jun 2026

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

5.3 Medium

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

2.1%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Access Control CWE-284

All CVSS Scores

CVSS v3.1 5.3 Medium

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

CVSS v2.0 5.0 Medium

AV:N/AC:L/Au:N/C:N/I:P/A:N

Potential Proof of Concepts

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

All Thrive Themes and Plugins - Unauthenticated Option Update

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 14:20 UTC

    Public PoC available

    Public proof-of-concept code published

  2. 15:34 UTC

    Nuclei template available

    Scanner coverage available

  3. 14:02 UTC

    CVE published

    Vulnerability disclosed publicly

  4. 10:36 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  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.

Start 14-day Pro trial Read API docs
  • 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-2021-24219

Sample API response 
{
  "cve_id": "CVE-2021-24219",
  "confidence": "High",
  "cvss_score": 5.3,
  "cvss_estimated": false,
  "epss_score": 0.02059,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}