CVE-2026-56785

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

8.4 High

FlatPress 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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Passive

What an attacker can affect

Confidentiality: High
Integrity: Low
Availability: None

Exploit likelihood

0.42%Up 0.2 points since Jun 24, 2026

What each source reports

CVE List Score used 8.4

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

Record: CVE-2026-56785
CVSS 4.0: 8.4 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2026-38634 8.4

Record: EUVD-2026-38634
CVSS 4.0: 8.4 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-gf5w-3f8w-9fm6 8.4

FlatPress versions prior to commit 10be83c, contains a stored cross-site scripting vulnerability...

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.

Record: GHSA-gf5w-3f8w-9fm6
CVSS 4.0: 8.4 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

NVD 8.4

Record: CVE-2026-56785
CVSS 4.0: 8.4 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 8.4

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

Record: CVE-2026-56785
CVSS 4.0: 8.4 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

flatpress

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-56785 is a high vulnerability (CVSS 8.4) in Flatpress, published June 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.42%, the 36th percentile. No source names a fixed version.