PatchSiren cyber security CVE debrief

CVE-2026-17567 wpmanageninja CVE debrief

The Fluent Forms plugin for WordPress, specifically versions up to and including 6.2.8, is vulnerable to Insecure Direct Object Reference (IDOR) attacks. This vulnerability is caused by a lack of proper validation on user-controlled keys, specifically the 'transaction' parameter. As a result, unauthenticated attackers can brute-force valid transaction hashes and gain access to sensitive payment receipt data. This data may include customer names, email addresses, billing addresses, order items, payment methods, and payment statuses belonging to other users. The effective brute-force space for attackers is approximately 900 candidates per second per (submission, form) pair, making exploitation practical without prior authentication or account access. Organizations using this plugin, especially those handling sensitive payment information, should prioritize patching to version 6.2.9 or later to prevent potential exposure of sensitive payment receipt data. This includes reviewing current deployments, updating affected systems, and monitoring for suspicious activity related to transaction hashes and payment receipt data access. Evidence supporting this vulnerability is based on public CVE and NVD details, highlighting the need for defenders to verify affected versions, review transaction handling, and monitor for suspicious activity related to transaction hashes.

Vendor: wpmanageninja
Product: Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
CVSS: MEDIUM 5.3
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-07-31
Original CVE updated: 2026-08-01
Advisory published: 2026-07-31
Advisory updated: 2026-08-01

Who should care

Organizations using the Fluent Forms plugin for WordPress, especially those handling sensitive payment information, should prioritize patching to prevent potential exposure of sensitive payment receipt data. This includes reviewing current deployments, updating affected systems, and monitoring for suspicious activity related to transaction hashes and payment receipt data access.

Technical summary

The Fluent Forms plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 6.2.8 via the 'transaction' parameter. This allows unauthenticated attackers to brute-force valid transaction hashes and view sensitive payment receipt data including customer name, email address, billing address, order items, payment method, and payment status belonging to other users.

Defensive priority

Organizations using the Fluent Forms plugin for WordPress should prioritize patching to prevent potential exposure of sensitive payment receipt data.

Recommended defensive actions

Patch the Fluent Forms plugin to version 6.2.9 or later
Review and update payment receipt data access controls
Monitor for suspicious activity related to transaction hashes
Perform a thorough review of current deployments to identify and update affected systems
Verify the implementation of compensating controls for exposed systems while remediation is scheduled and verified
Check relevant monitoring, detection, and logs for exposed assets that need extra review
Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The Fluent Forms plugin for WordPress is vulnerable to Insecure Direct Object Reference due to missing validation on a user-controlled key. This allows unauthenticated attackers to brute-force valid transaction hashes and view sensitive payment receipt data. Evidence is limited to public CVE and NVD details. Defenders should verify affected versions, review transaction handling, and monitor for suspicious activity related to transaction hashes.

Sources and references

Verified primary and authoritative sources

CVE-2026-17567 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-17567

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-17567 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-17567

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Source reference
Unverified legacy reference

URL: https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.4/app/Modules/Payments/PaymentHandler.php

[email protected]
Source reference
Unverified legacy reference

URL: https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.4/app/Modules/Payments/PaymentMethods/BaseProcessor.php

[email protected]
Source reference
Unverified legacy reference

URL: https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.4/app/Modules/Payments/TransactionShortcodes.php

[email protected]
Source reference
Unverified legacy reference

URL: https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Modules/Payments/PaymentHandler.php

[email protected]
Source reference
Unverified legacy reference

URL: https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Modules/Payments/PaymentMethods/BaseProcessor.php

[email protected]
Source reference
Unverified legacy reference

URL: https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Modules/Payments/TransactionShortcodes.php

[email protected]
Source reference
Unverified legacy reference

URL: https://plugins.trac.wordpress.org/changeset/3625751/fluentform/trunk/app/Modules/Payments/PaymentMethods/BaseProcessor.php

[email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.