CVE-2018-25332 -- CVSS 9.8 Vulnerability Briefing

CVE-2018-25332 | CVSS 9.8 (Critical) | Exploit: No known exploit

What Is It

CVE-2018-25332 is an unauthenticated remote code execution vulnerability in GitBucket 4.23.1, a self-hosted Git repository management platform, arising from weak secret token generation combined with insecure file upload handling.

Technical Detail

The vulnerability stems from two compounding weaknesses: GitBucket 4.23.1 generates secret tokens using a predictable or insufficiently random algorithm, and the application permits insecure file uploads without adequate validation. An unauthenticated attacker can exploit the weak token generation to forge or bypass authentication controls, then leverage the insecure file upload functionality to deliver and execute arbitrary code on the server. Successful exploitation results in full remote code execution under the privileges of the GitBucket process, potentially granting complete control of the host system.

Exploitation Status

No known exploit has been publicly documented or confirmed for this vulnerability at this time. It is not listed in the CISA Known Exploited Vulnerabilities catalog. Despite the critical CVSS score of 9.8, there is no evidence of active exploitation in the wild, no public proof-of-concept code, and no reported weaponization as of May 24, 2026.

Who Is Targeting This

No specific threat actor attribution at this time. Neither confirmed nor reported threat actor activity has been associated with this CVE in available intelligence sources.

What To Do

Organizations running GitBucket 4.23.1 should upgrade to a patched version immediately, prioritizing this action given the critical severity rating and the unauthenticated attack vector. If an immediate upgrade is not feasible, restrict network access to the GitBucket instance by placing it behind a firewall or VPN, limiting exposure to trusted IP ranges only. Review server logs for anomalous file upload activity and unexpected process execution originating from the GitBucket service account. Audit any existing secret tokens configured within the application and rotate them following an upgrade. Confirm the version in use across all deployments, as this vulnerability is specific to version 4.23.1 and the exposure window for unpatched instances remains open.