CVE-2026-4302Public exploitNetwork attack vector

Unauthenticated SSRF via unchecked REST webhook URL

Published Mar 21, 2026 · Updated Mar 21, 2026

SSRF in WPXPO WowOptin 1.4.29 and earlier allows remote attackers to query or modify internal services through a public REST endpoint. The optn/v1/integration-action route accepts the link parameter without authentication, and Webhook::add_subscriber passes it to wp_remote_get or wp_remote_post without URL validation. Any internet-reachable WordPress site running an affected version exposes requests from the web server to arbitrary network locations, including internal services.

CVSS severity7.2
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in WPXPO WowOptin 1.4.29 and earlier allows remote attackers to query or modify internal services through a public REST endpoint. The optn/v1/integration-action route accepts the link parameter without authentication, and Webhook::add_subscriber passes it to wp_remote_get or wp_remote_post without URL validation. Any internet-reachable WordPress site running an affected version exposes requests from the web server to arbitrary network locations, including internal services.

The record

CVE
CVE-2026-4302
Published
Mar 21, 2026
Updated
Mar 21, 2026
Vendor
WPXPO
Product
WowOptin
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 21, 2026Record 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=* <=1.4.29

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WPXPO · WowOptinversion=* <=1.4.29

Published CVSS scores

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/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-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

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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