Which versions of Pybbs are affected by CVE-2025-8546?

Organizations using atjiu pybbs should be aware of moderate risk from CVE-2025-8546, a improper authentication vulnerability rated CVSS 5.5.. A patch is available.

Is there a public PoC exploit available for CVE-2025-8546?

Yes, a public proof-of-concept exploit is available for CVE-2025-8546. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-8546?

Within 30 days: Identify affected systems running atjiu pybbs and apply vendor patches as part of regular patch cycle. Audit authentication configurations.

Pybbs CVE-2025-8546

Q: What is the CVSS score of CVE-2025-8546?

CVE-2025-8546 has a CVSS 4.0 base score of 5.5 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.1%.

MEDIUM

Improper Authentication (CWE-287)

2025-08-05 cna@vuldb.com

Authentication Bypass Pybbs Pybbs Project

5.5

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:05 vuln.today

Patch released

Mar 28, 2026 - 19:05 nvd

Patch available

PoC Detected

Sep 03, 2025 - 14:00 vuln.today

Public exploit code

CVE Published

Aug 05, 2025 - 05:15 nvd

MEDIUM 5.5

DescriptionCVE.org

A vulnerability, which was classified as problematic, was found in atjiu pybbs up to 6.0.0. This affects the function adminlogin/login of the component Verification Code Handler. The manipulation leads to guessable captcha. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The patch is named ecaf8d46944fd03e3c4ea05698f8acf0aaa570cf. It is recommended to apply a patch to fix this issue.

AnalysisAI

A vulnerability, which was classified as problematic, was found in atjiu pybbs up to 6.0.0. Rated medium severity (CVSS 5.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. A vulnerability, which was classified as problematic, was found in atjiu pybbs up to 6.0.0. This affects the function adminlogin/login of the component Verification Code Handler. The manipulation leads to guessable captcha. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The patch is named ecaf8d46944fd03e3c4ea05698f8acf0aaa570cf. It is recommended to apply a patch to fix this issue. Affected products include: Pybbs Project Pybbs. Version information: up to 6.0.0..

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.