Security readout for executives and security teams
Plain-English summary
A WordPress payment-form plugin can accept fake PayPal payment notifications when IPN verification is disabled by default. An unpaid submission may be marked paid, which can trigger emails, access grants, or digital product delivery without real payment.
Executive priority
Treat as high priority for ecommerce, membership, donation, or digital-delivery sites using this plugin with PayPal. The risk is direct revenue loss or unauthorized access rather than server takeover.
Technical view
CVE-2026-2428 affects Fluent Forms Pro Add On Pack up to and including 6.1.17. The PayPal IPN verification setting reportedly defaults to disabled, causing insufficient data authenticity checks. The issue is rated CVSS 7.5, network exploitable, unauthenticated, low complexity, with high integrity impact.
Likely exposure
Exposure is likely limited to WordPress sites running Fluent Forms Pro Add On Pack through 6.1.17 and using PayPal/IPN-driven payment workflows. Sites not using this plugin or PayPal payment automation are less likely to be affected.
Exploitation context
Sources describe unauthenticated forged PayPal IPN notifications to a public endpoint. CISA KEV is false in the provided data, and no cited source establishes active exploitation. Business impact is mainly payment fraud and unauthorized fulfillment actions.
Researcher notes
Evidence identifies CWE-345 and a default-disabled PayPal IPN verification setting in PayPalSettings.php. The provided data does not include exploit-in-the-wild proof or a specific fixed version. Validate against vendor changelog before closing remediation.
Mitigation direction
- Inventory WordPress sites using Fluent Forms Pro Add On Pack.
- Prioritize sites using PayPal payments or post-payment automation.
- Check vendor changelog and guidance for the fixed version.
- Upgrade if a vendor-fixed release is available.
- Review PayPal IPN verification settings and enable verification where supported.
- Temporarily disable risky payment automation if verification cannot be assured.
Validation and detection
- Confirm installed Fluent Forms Pro Add On Pack version.
- Identify forms using PayPal payment workflows.
- Review whether IPN verification is disabled.
- Check logs for paid status changes without matching PayPal payments.
- Confirm post-payment emails, access grants, or deliveries are not firing incorrectly.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-345: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-2428 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Insufficient Verification of Data Authenticity
Insufficient Verification of Data Authenticity represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.