CVE-2026-56785Network attack vector

Stored script execution via unescaped form fields

Published Jun 23, 2026 · Updated Jun 23, 2026

Stored XSS in FlatPress before commit 10be83c allows remote attackers to execute scripts in viewers' browsers through comment or contact fields. Smarty templates render stored name, URL, and email values without contextual escaping, while URL handling fails to restrict links reliably to HTTP or HTTPS. Submission requires no authentication, but impact occurs when another user, including an administrator, views the stored content.

CVSS severity8.4
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in FlatPress before commit 10be83c allows remote attackers to execute scripts in viewers' browsers through comment or contact fields. Smarty templates render stored name, URL, and email values without contextual escaping, while URL handling fails to restrict links reliably to HTTP or HTTPS. Submission requires no authentication, but impact occurs when another user, including an administrator, views the stored content.

The record

CVE
CVE-2026-56785
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
FlatPress
Product
FlatPress
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=10be83c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FlatPress · FlatPressversion=0 <=10be83c

Published CVSS scores

8.4VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
8.2VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo