CVE-2026-56785

HIGH 8.2

FlatPress - Stored Cross-Site Scripting via Unescaped Comment and Contact Form Fields

CVSS Score

8.2

EPSS Score

0.0%

EPSS Percentile

0th

FlatPress versions prior to commit 10be83c, contains a stored cross-site scripting vulnerability in comment and contact forms where name, URL, and email fields are rendered without proper output encoding in Smarty templates. Attackers can inject arbitrary HTML and JavaScript through these fields to execute malicious scripts in browsers of viewers including administrators, or bypass URL scheme validation to inject javascript: or data: URIs.

CWE	CWE-79
Vendor	flatpress
Product	flatpress
Published	Jun 23, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

None

Affected Versions

FlatPress / FlatPress

0 ≤ 10be83c

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/flatpressblog/flatpress/commit/10be83cbaac5ce0e51250b9d57de7f257b8f34f8 github.com: https://github.com/dilipk5/flatpressd-cms-sxss vulncheck.com: https://www.vulncheck.com/advisories/flatpress-stored-cross-site-scripting-via-unescaped-comment-and-contact-form-fields

Credits

Fraenkiman Dilipkumar Choudhary