CVE-2024-4023

Stored XSS in flatpressblog/flatpress

HIGH
8.1
CVSS Score
Published: March 20, 2025 at 10:09 AM UTC
Updated: June 17, 2026 at 08:00 AM UTC
2 products affected across 2 vendorsFlatPressFlatpress

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Severity
HIGH8.1
Exploit prediction
EPSS 0.8%
SSVC
PoC

Description

A stored cross-site scripting (XSS) vulnerability exists in flatpressblog/flatpress version 1.3. When a user uploads a file with a `.xsig` extension and directly accesses this file, the server responds with a Content-type of application/octet-stream, leading to the file being processed as an HTML file. This allows an attacker to execute arbitrary JavaScript code, which can be used to steal user cookies, perform HTTP requests, and access content of the same origin.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.3
Affected range stops below 1.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGH@huntr_ai
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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