CVE-2025-63523Public exploitNetwork attack vector

Authenticated username changes via unfiltered update parameter

Published Dec 1, 2025 · Updated Dec 1, 2025

Authorization bypass in FeehiCMS 2.1.1 allows remote authenticated users to change account usernames through user-update requests. The user-update backend accepts a client-supplied username field even though the interface marks it read-only, without omitting the field or enforcing an allowed-field list. Access to the backend user module is required, and successful exploitation changes the stored username associated with a user record.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in FeehiCMS 2.1.1 allows remote authenticated users to change account usernames through user-update requests. The user-update backend accepts a client-supplied username field even though the interface marks it read-only, without omitting the field or enforcing an allowed-field list. Access to the backend user module is required, and successful exploitation changes the stored username associated with a user record.

The record

CVE
CVE-2025-63523
Published
Dec 1, 2025
Updated
Dec 1, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 1, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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.

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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-125Out-of-bounds Read
T1098Account Manipulation

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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