Improper Authentication Vulnerability in Rebuild by Unknown Vendor
CVE-2026-102248

6.9MEDIUM

Key Information:

Vendor

Unknown Vendor

Status
Rebuild
Vendor
CVE Published:
29 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-102248?

A vulnerability has been found in Rebuild versions up to 4.4.7 and 4.5.0-beta5 that allows for improper authentication through the login endpoint located at /user/login. This flaw enables remote attackers to exploit the authentication process, potentially leading to unauthorized access. The exploit code is publicly available, which heightens the risk for affected users. Despite notification attempts, there has been no response from the vendor regarding this critical issue.

Affected Version(s)

Rebuild 4.4.0

Rebuild 4.4.1

Rebuild 4.4.2

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-2026-102248 - Proof of Concept

References

https://vuldb.com/vuln/411150
vdb-entry
https://vuldb.com/vuln/411150/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-102248
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
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

asants (VulDB User)
VulDB CNA Team
.