CVE-2026-9581Public exploitNetwork attack vector

Authenticated comment impersonation via mass assignment

Published May 26, 2026 · Updated May 26, 2026

Mass assignment in JeecgBoot 3.9.0 through 3.9.1 allows remote authenticated users to post comments as other users. SysCommentController.add accepts a complete SysComment entity and saves attacker-supplied fromUserId and toUserId values without replacing them with the authenticated identity. Any authenticated account can reach the endpoint because it lacks a permission annotation, allowing forged comment attribution but not granting the impersonated account's privileges.

CVSS severity6.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Mass assignment in JeecgBoot 3.9.0 through 3.9.1 allows remote authenticated users to post comments as other users. SysCommentController.add accepts a complete SysComment entity and saves attacker-supplied fromUserId and toUserId values without replacing them with the authenticated identity. Any authenticated account can reach the endpoint because it lacks a permission annotation, allowing forged comment attribution but not granting the impersonated account's privileges.

The record

CVE
CVE-2026-9581
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Beijing Guoju Information Technology Co., Ltd.
Product
JeecgBoot
Classifications
CWE-284, CWE-266, T1036
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record 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=3.9.0
  2. Affected versionversion=3.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Beijing Guoju Information Technology Co., Ltd. · JeecgBootversion=3.9.0; version=3.9.1

Published CVSS scores

2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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-284Improper Access Control
CWE-266Incorrect Privilege Assignment
T1036Masquerading

Public exploit references

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Technologies

Your stack

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Your stack

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