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CVE Record

CVE-2026-3453: ProfilePress <= 4.16.11 - Insecure Direct Object Reference to Authenticated (Subscriber+) Arbitrary Subscription Cancellation/Expiration

The ProfilePress plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 4.16.11. This is due to missing ownership validation on the change_plan_sub_id parameter in the process_checkout() function. The ppress_process_checkout AJAX handler accepts a user-controlled subscription ID intended for plan upgrades, loads the subscription record, and cancels/expires it without verifying the subscription belongs to the requesting user. This makes it possible for authenticated attackers, with Subscriber-level access and above, to cancel and expire any other user's active subscription via the change_plan_sub_id parameter during checkout, causing immediate loss of paid access for victims.

HighCVSS 8.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-3453 lets any logged-in WordPress user with Subscriber-level access cancel or expire another customer’s ProfilePress subscription. For membership or paid-content sites, this can immediately remove paid access for legitimate users and disrupt revenue operations.

Executive priority

Prioritize remediation for revenue-generating membership sites. The issue can be abused by ordinary registered users to disrupt customer access and support operations, even without administrator privileges.

Technical view

ProfilePress versions up to and including 4.16.11 have an IDOR flaw in process_checkout(). The AJAX checkout handler accepts a user-controlled change_plan_sub_id, loads that subscription, and cancels/expires it without confirming ownership. CVSS is 8.1, with high integrity and availability impact.

Likely exposure

Exposure is most relevant to WordPress sites using ProfilePress paid memberships or subscription features on versions through 4.16.11. Sites allowing public user registration have a lower barrier because attackers only need Subscriber-level access.

Exploitation context

The vulnerability is remotely reachable by authenticated users and requires no victim interaction. The provided sources do not show CISA KEV listing or confirmed active exploitation. Impact is business-disruptive rather than data theft focused.

Researcher notes

Sources identify CWE-639 and point to CheckoutController.php plus WordPress changeset 3474509. The bundle does not provide exploit evidence or a clearly named fixed release, so remediation should be confirmed against current vendor/plugin guidance.

Mitigation direction

  • Update ProfilePress beyond 4.16.11 if a vendor release is available.
  • Review Wordfence, WordPress plugin, and vendor guidance for the fixed version.
  • Restrict account creation if public registration is not required.
  • Temporarily disable affected membership checkout/subscription-change features if updating is not possible.
  • Monitor for unexpected subscription cancellations or expirations.

Validation and detection

  • Inventory WordPress sites using the ProfilePress plugin.
  • Confirm installed ProfilePress versions are not 4.16.11 or earlier.
  • Check whether paid membership or subscription functionality is enabled.
  • Review subscription audit logs for unusual cancellations or expirations.
  • Verify the patched checkout controller includes ownership validation for subscription changes.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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cwe · low confidence lookup

CWE-639: Exact CWE lookup

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cve · low confidence lookup

CVE-2026-3453 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.1 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.1CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H2.85.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

8.1High
CVSS 3.1 vector shape for CVE-2026-3453Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
properfractionPaid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress0unaffected
Weakness

CWE details

CWE-639

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-639 · source CWE mapping

Authorization Bypass Through User-Controlled Key

Authorization Bypass Through User-Controlled Key represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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