Auth bypass in Gitbucket
CVE-2018-25332
GitBucket 4.23.1 contains an unauthenticated remote code execution vulnerability that allows attackers to execute arbitrary commands by exploiting weak secret token generation and insecure file upload functionality. Attackers can brute-force the Blowfish encryption key, upload a malicious JAR plugin via the git-lfs endpoint, and execute system commands through an exposed exploit endpoint.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Gitbucket — versions 4.23.1
Weakness classification (CWE)
References
- github.com/gitbucket/gitbucket (Product, product)
- security.szurek.pl/ (product, Not Applicable, Press/Media Coverage)
- www.exploit-db.com/exploits/44668 (Exploit, Patch, exploit)
- www.vulncheck.com/advisories/gitbucket-unauthenticated-remote-code-execution (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2018-25332?
- CVE-2018-25332 is a critical-severity vulnerability in Gitbucket, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-05-17.
- How severe is CVE-2018-25332?
- Critical severity. CVSS v3 base score is 9.8 out of 10.