CVE-2023-1104Public exploitNetwork attack vector

Stored script execution via uploaded Pages files

Published Mar 1, 2023 · Updated Mar 11, 2025

Stored XSS in FlatPress before 1.3 allows remote authenticated users to run script in an administrator's browser via a .pages upload. The extension denylist in admin/panels/uploader/admin.uploader.php fails to reject Apple Pages archives that can contain malicious JavaScript. Exploitation requires uploader access and an administrator to open the stored file, enabling script execution in that browser context.

CVSS severity5.4
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in FlatPress before 1.3 allows remote authenticated users to run script in an administrator's browser via a .pages upload. The extension denylist in admin/panels/uploader/admin.uploader.php fails to reject Apple Pages archives that can contain malicious JavaScript. Exploitation requires uploader access and an administrator to open the stored file, enabling script execution in that browser context.

The record

CVE
CVE-2023-1104
Published
Mar 1, 2023
Updated
Mar 11, 2025
Vendor
FlatPress
Product
FlatPress
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FlatPress · FlatPressversion=unspecified <1.3

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
8.1huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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