CVE-2025-4036Network attack vector

Authenticated unauthorized chapter updates

Published Apr 28, 2025 · Updated Apr 28, 2025

Improper access control in xxyopen Novel 3.5.0 allows remote authenticated users to update chapter records through the author interface. The record locates the flaw in updateBookChapter in AuthorController but does not disclose the missing authorization decision or the request fields that trigger it. An author account is required; published evidence does not establish whether unauthorized updates are confined to other authors' chapters or extend further.

CVSS severity5.3
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Improper access control in xxyopen Novel 3.5.0 allows remote authenticated users to update chapter records through the author interface. The record locates the flaw in updateBookChapter in AuthorController but does not disclose the missing authorization decision or the request fields that trigger it. An author account is required; published evidence does not establish whether unauthorized updates are confined to other authors' chapters or extend further.

The record

CVE
CVE-2025-4036
Published
Apr 28, 2025
Updated
Apr 28, 2025
Vendor
xxyopen
Product
Novel
Classifications
CWE-266, CWE-284, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=3.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

xxyopen · Novelversion=3.5.0

Published CVSS scores

6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-266Incorrect Privilege Assignment
CWE-284Improper Access Control
T1190Exploit Public-Facing Application

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

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Your stack

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