FlatPress - Stored Cross-Site Scripting via Unescaped Comment and Contact Form Fields
Priority LOW 37CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00421 36th percentileScored 2026-11-07
Fix Fixed FlatPress (FlatPress): 10be83c
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| flatpressblog | FlatPress | before 10be83c | 10be83c | Patch available | CNA |
- FlatPress Vendorflatpressblog Affected before 10be83c Fixed in 10be83c Patch available CNA
Remediation
- Fix · CNA FlatPress (FlatPress) Fixed in 10be83c
Timeline
- 2026-10-02 Threatist record created from CVE-2026-56785
- 2026-10-03 Alias added: GHSA-gf5w-3f8w-9fm6
References
More flatpressblog vulnerabilities
- TI-2023-00898 Path Traversal in flatpressblog/flatpress CVSS 3.1CRITICAL 9.8
- TI-2022-04209 PHP Remote File Inclusion in flatpressblog/flatpress CVSS 3.1CRITICAL 9.8
- TI-2023-01045 External Control of File Name or Path in flatpressblog/flatpress CVSS 3.1HIGH 8.1
- TI-2022-18965 Flatpress v1.2.1 was discovered to contain a remote code execution (RCE) vulnerability in the Upload File function. CVSS 3.1HIGH 7.2
- TI-2024-09138 Cross-Site Request Forgery (CSRF) in flatpressblog/flatpress CVSS 3.0HIGH 8.0
- TI-2024-03752 Stored XSS in flatpressblog/flatpress CVSS 3.0HIGH 8.1
Sources
- CVE-2026-56785 · CVE Program
- CVE-2026-56785 · NVD
- FIRST EPSS
- GHSA-gf5w-3f8w-9fm6 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences