CVE-2026-3453Network attack vector

Authenticated subscription cancellation via unchecked ownership

Published Mar 11, 2026 · Updated Mar 11, 2026

Authorization bypass in Proper Fraction ProfilePress 4.16.11 and earlier allows remote authenticated users to cancel other users' subscriptions. The process_checkout() function trusts the user-controlled change_plan_sub_id value, loads that subscription, and cancels or expires it without confirming ownership. Subscriber-level access and a checkout request are sufficient to terminate another user's active subscription and immediately remove that user's paid access.

CVSS severity8.1
High
EPSS probability0.38%
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 Proper Fraction ProfilePress 4.16.11 and earlier allows remote authenticated users to cancel other users' subscriptions. The process_checkout() function trusts the user-controlled change_plan_sub_id value, loads that subscription, and cancels or expires it without confirming ownership. Subscriber-level access and a checkout request are sufficient to terminate another user's active subscription and immediately remove that user's paid access.

The record

CVE
CVE-2026-3453
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
ProfilePress Membership Team
Product
ProfilePress
Classifications
CWE-639, T1531
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 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=* <=4.16.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ProfilePress Membership Team · ProfilePressversion=* <=4.16.11

Published CVSS scores

8.1WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1531Account Access Removal

Public exploit references

No public exploit references are available in this record.

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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