Auth bypass in Atjiu Pybbs
CVE-2025-8546
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Atjiu Pybbs — versions 6.0
- Pybbs Project
Weakness classification (CWE)
Public proof-of-concept exploits
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/atjiu/pybbs/issues/199 (issue-tracking, Exploit, Issue Tracking)
- github.com/atjiu/pybbs/issues/199 (issue-tracking, Issue Tracking)
- github.com/atjiu/pybbs/issues/199 (issue-tracking, Exploit, exploit, Issue Tracking)
- github.com/atjiu/pybbs/commit/ecaf8d46944fd03e3c4ea05698f8acf0aaa570cf (Patch, patch)
Frequently asked questions
- What is CVE-2025-8546?
- CVE-2025-8546 is a medium-severity vulnerability in Atjiu Pybbs, classified under Improper Authentication. CVSS score: 5.3/10. Published 2025-08-05.
- How severe is CVE-2025-8546?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2025-8546 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.