CVE-2026-17567Fluent Forms <= 6.2.8 - Unauthenticated Sensitive Information Exposure via Insecure Direct Object Reference and Weak Transaction Hash in 'transaction' Parameter
- 5.3MediumCVSS base score
- 0.63%Exploitation in 30 daysEPSS · top 49% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 6.2.8 via the 'transaction' parameter due to missing validation on a user controlled key. This makes it possible for 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. Because submission ID, form ID, and transaction creation time are either observable or guessable by an attacker, the effective brute-force space is bounded to approximately 900 candidates per second per (submission, form) pair, making exploitation practical without any prior authentication or account.
Timeline
ID reserved
By Wordfence
- 4 days later
· 4 days later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WordfenceCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| NVDNVD · Deferred | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.63% · top 49% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Affected products
References
References9
- https://www.wordfence.com/threat-intel/vulnerabilities/id/565980d7-8dc9-42a4-90c5-2f75af52fb8e?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.4/app/Modules/Payments/PaymentMethods/BaseProcessor.php#L959 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Modules/Payments/PaymentMethods/BaseProcessor.php#L959 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Modules/Payments/TransactionShortcodes.php#L107 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Modules/Payments/PaymentHandler.php#L218 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.4/app/Modules/Payments/TransactionShortcodes.php#L107 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.4/app/Modules/Payments/PaymentHandler.php#L218 (opens in a new tab)
- https://plugins.trac.wordpress.org/changeset?old_path=%2Ffluentform/tags/6.2.8&new_path=%2Ffluentform/tags/6.2.9 (opens in a new tab)
- https://plugins.trac.wordpress.org/changeset/3625751/fluentform/trunk/app/Modules/Payments/PaymentMethods/BaseProcessor.php (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-51517 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-17567)Record last updated .