CyberSecBulletin
CVE-2026-107153NVD status: Deferred

Rakuten Mini: Use of Weak Credentials

Published Updated By the CyberSecBulletin desk

CVE-2026-107153 is a high-severity use of weak credentials vulnerability in Rakuten Mini from Rakuten Mobile, with a CVSS 4.0 base score of 7.0 out of 10. It can be exploited with physical access to the device by an attacker with a low-privileged account, without any action from a user. Affected Rakuten Mini versions: all versions. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.2% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Check which version of Rakuten Mini you run against the affected versions below, and install the vendor's latest release.

Affected products and versions

VendorProductAffected versionsFixed in
Rakuten MobileRakuten Miniall versionsNot stated
Rakuten MobileRakuten Handall versionsNot stated
Rakuten MobileRakuten Hand 5Gall versionsNot stated
Rakuten MobileRakuten BIGsall versionsNot stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
PhysicalThe attacker must physically touch the device.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Attack requirements
NoneThe attack does not depend on a particular deployment or configuration.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Confidentiality (vulnerable system)
HighSerious loss of confidentiality on the vulnerable system.
Integrity (vulnerable system)
HighSerious loss of integrity on the vulnerable system.
Availability (vulnerable system)
HighSerious loss of availability on the vulnerable system.
Confidentiality (other systems)
NoneNo loss of confidentiality on systems beyond the vulnerable one.
Integrity (other systems)
NoneNo loss of integrity on systems beyond the vulnerable one.
Availability (other systems)
NoneNo loss of availability on systems beyond the vulnerable one.

Vector: CVSS:4.0/AV:P/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. Scored by CNA (jpcert.or.jp).

Scoring systemScoreSeverityScored by
CVSS 4.07.0HighCNA (jpcert.or.jp)
CVSS 3.06.6MediumCNA (jpcert.or.jp)

Official description

Multiple smartphones provided by Rakuten Mobile, Inc. utilize AOSP test keys for their Android Verified Boot (AVB) functionality. With physical access to the affected device, a crafted system image may be installed.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Use of Weak Credentials

The product uses weak credentials (such as a default key or hard-coded password) that can be calculated, derived, reused, or guessed by an attacker.

How developers prevent this class of flaw

  • When the user changes or sets a password, check the password against a database of already compromised or breached passwords. These passwords are likely to be used in password guessing attacks.

More Use of Weak Credentials vulnerabilities (CWE-1391)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Use of Weak Credentials vulnerabilities

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