Vulnerability · Published Sep 29, 2026 · Assigned by VulDB

CVE-2026-102248Rebuild Login Endpoint login improper authentication

High 7.3

In plain English

A high-severity improper authentication in Rebuild. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.4%top 67.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
n/a	Rebuild	4.4.04.4.14.4.24.4.34.4.44.4.54.4.64.4.7

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C

References

VDB-411150 | Rebuild Login Endpoint login improper authentication vdb-entry
VDB-411150 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-102248 | CVE Analysis and Report third-party-advisory
Submit #933708 | REBUILD 4.4.7-release Improper Authentication third-party-advisory
https://github.com/ASantsSec/CVE/issues/25 exploit, issue-tracking