Guessable Captcha Vulnerability in Atyiu Pybbs up to Version 6.0.0
CVE-2025-8546

6.9MEDIUM

Key Information:

Vendor

Atjiu

Status
Pybbs
Vendor
CVE Published:
5 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-8546?

A vulnerability exists in Atyiu pybbs versions up to 6.0.0 within the Verification Code Handler, allowing for guessable captcha solutions. This flaw can be exploited remotely, potentially enabling unauthorized access to user accounts. As the issue has been publicly disclosed, it is crucial for users and administrators to apply the recommended patch immediately to safeguard against potential exploitation.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

pybbs 6.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-8546 - Proof of Concept

References

https://vuldb.com/?id.318675
vdb-entrytechnical-description
https://vuldb.com/?ctiid.318675
signaturepermissions-required
https://vuldb.com/?submit.622179
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ZAST.AI (VulDB User)
JSON
.