CVE-2026-16587Network attack vector

Subscriber-level OAuth token overwrite via unchecked auth_redirect

Published Jul 28, 2026 · Updated Jul 28, 2026

Authorization bypass in Advanced Form Integration 2.6.0 and earlier allows remote authenticated users to overwrite stored MailUp OAuth tokens. The auth_redirect() handler runs on admin_init and writes request-supplied tokens to the adfoin_mailup_keys option without a capability check. Subscriber-level access to /wp-admin/profile.php is sufficient to redirect future form-submission data to an attacker-controlled MailUp account or disable the integration.

CVSS severity4.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Advanced Form Integration 2.6.0 and earlier allows remote authenticated users to overwrite stored MailUp OAuth tokens. The auth_redirect() handler runs on admin_init and writes request-supplied tokens to the adfoin_mailup_keys option without a capability check. Subscriber-level access to /wp-admin/profile.php is sufficient to redirect future form-submission data to an attacker-controlled MailUp account or disable the integration.

The record

CVE
CVE-2026-16587
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
Nasir Ahmed
Product
Advanced Form Integration
Classifications
CWE-862, T1537, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=0 <=2.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nasir Ahmed · Advanced Form Integrationversion=0 <=2.6.0

Published CVSS scores

4.3WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1537Transfer Data to Cloud Account
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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