Auth bypass in Rebuild
CVE-2026-102248
A vulnerability was identified in Rebuild up to 4.4.7/4.5.0-beta5. This affects an unknown part of the file /user/login of the component Login Endpoint. The manipulation leads to improper authentication. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: Broken Authentication
Published .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Rebuild — versions 4.4.0, 4.4.1, 4.4.2
Weakness classification (CWE)
References
- vuldb.com/vuln/411150 (vdb-entry)
- vuldb.com/vuln/411150/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-102248 (third-party-advisory)
- vuldb.com/submit/933708 (third-party-advisory)
- github.com/ASantsSec/CVE/issues/25 (issue-tracking, exploit)
Frequently asked questions
- What is CVE-2026-102248?
- CVE-2026-102248 is a high-severity vulnerability in Rebuild, classified under Improper Authentication. CVSS score: 7.3/10. Published 2026-09-29.
- How severe is CVE-2026-102248?
- High severity. CVSS v3 base score is 7.3 out of 10.