CVE-2026-66633Network attack vector

Script execution via undisclosed output escaping flaw

Published Aug 18, 2026 · Updated Aug 18, 2026

Cross-site scripting in WPManageNinja Fluent Forms Pro Add On Pack before 6.2.12 allows remote attackers to run script via crafted input. Public records do not identify the affected parameter or sink; WPManageNinja's 6.2.12 release notes say the fix hardened output escaping across entries, payments, reports, integrations, and Pro file uploads. Exploitation is network-reachable and unauthenticated but still requires user interaction, so exposure depends on a victim loading the malicious content in an affected workflow; published scoring bounds the impact to low-level confidentiality, integrity, and availability effects.

CVSS severity7.1
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in WPManageNinja Fluent Forms Pro Add On Pack before 6.2.12 allows remote attackers to run script via crafted input. Public records do not identify the affected parameter or sink; WPManageNinja's 6.2.12 release notes say the fix hardened output escaping across entries, payments, reports, integrations, and Pro file uploads. Exploitation is network-reachable and unauthenticated but still requires user interaction, so exposure depends on a victim loading the malicious content in an affected workflow; published scoring bounds the impact to low-level confidentiality, integrity, and availability effects.

The record

CVE
CVE-2026-66633
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
Mahmudul Hasan Arif
Product
Fluent Forms Pro Add-on
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 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=n/a <6.2.12 changes=[{"at":"6.2.12","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mahmudul Hasan Arif · Fluent Forms Pro Add-onversion=n/a <6.2.12 changes=[{"at":"6.2.12","status":"unaffected"}]

Published CVSS scores

7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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