CVE-2021-24916Public exploitNetwork attack vector

Arbitrary email sending via unchecked AJAX fields

Published Aug 7, 2023 · Updated Oct 15, 2024

Improper access control in Themeum Qubely before 1.8.6 allows remote attackers to send arbitrary email through a public AJAX action. The qubely_send_form_data handler accepts caller-supplied recipient, sender, subject, and body fields without confirming an authorized contact-form submission. No account is required; any reachable WordPress site exposing the action can relay attacker-chosen messages.

CVSS severity7.5
High
EPSS probability1.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Themeum Qubely before 1.8.6 allows remote attackers to send arbitrary email through a public AJAX action. The qubely_send_form_data handler accepts caller-supplied recipient, sender, subject, and body fields without confirming an authorized contact-form submission. No account is required; any reachable WordPress site exposing the action can relay attacker-chosen messages.

The record

CVE
CVE-2021-24916
Published
Aug 7, 2023
Updated
Oct 15, 2024
Vendor
Themeum
Product
Qubely
Classifications
CWE-284
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.8.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Themeum · Qubelyversion=0 <1.8.6

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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