CVE-2026-8196Public exploitNetwork attack vector

Unauthenticated password guessing via captcha-free login route

Published May 9, 2026 · Updated May 9, 2026

Captcha bypass in JEECG JeecgBoot 3.9.1 allows remote attackers to make unrestricted password guesses through the mobile login route. LoginController's /sys/mLogin handler accepts the same username and password body as /sys/login but omits captcha validation, rate limiting, and account lockout. No prior access or user interaction is required to make attempts, enabling unrestricted password guessing and credential stuffing; successful guesses return a normal JWT and user data.

CVSS severity3.7
Low
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Captcha bypass in JEECG JeecgBoot 3.9.1 allows remote attackers to make unrestricted password guesses through the mobile login route. LoginController's /sys/mLogin handler accepts the same username and password body as /sys/login but omits captcha validation, rate limiting, and account lockout. No prior access or user interaction is required to make attempts, enabling unrestricted password guessing and credential stuffing; successful guesses return a normal JWT and user data.

The record

CVE
CVE-2026-8196
Published
May 9, 2026
Updated
May 9, 2026
Vendor
Beijing Guoju Information Technology Co., Ltd.
Product
JeecgBoot
Classifications
CWE-285, CWE-639, T1110.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 9, 2026CVE publishedPublication date reported by the CVE source.
  2. May 9, 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=3.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

3.7VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
2.6VulDBAV:N/AC:H/Au:N/C:P/I:N/A:N
2.9VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-285Improper Authorization
CWE-639Authorization Bypass Through User-Controlled Key
T1110.001Password Guessing

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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