CVE-2025-8547Public exploitNetwork attack vector

Account impersonation via skipped registration email verification

Published Aug 5, 2025 · Updated Aug 5, 2025

Improper authorization in atjiu pybbs 6.0.0 allows remote attackers to register accounts using unverified email addresses. IndexApiController.register creates and signs in a user without requiring an emailCode and passes true as the activation flag, even when user_need_active requires verification. No prior account is required; a valid CAPTCHA is still required, and successful abuse permits bulk account creation and impersonation of email-address owners.

CVSS severity5.3
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in atjiu pybbs 6.0.0 allows remote attackers to register accounts using unverified email addresses. IndexApiController.register creates and signs in a user without requiring an emailCode and passes true as the activation flag, even when user_need_active requires verification. No prior account is required; a valid CAPTCHA is still required, and successful abuse permits bulk account creation and impersonation of email-address owners.

The record

CVE
CVE-2025-8547
Published
Aug 5, 2025
Updated
Aug 5, 2025
Vendor
atjiu
Product
pybbs
Classifications
CWE-266, CWE-285, T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

atjiu · pybbsversion=6.0

Published CVSS scores

5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
5.0VulDBAV:N/AC:L/Au:N/C:N/I:P/A:N
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-266Incorrect Privilege Assignment
CWE-285Improper Authorization
T1136Create Account

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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