CVE-2025-66461VulnerabilityPublished 8 Dec 2025

CVE-2025-66461: GS Yuasa International FULLBACK Manager Pro (for Windows) · Unquoted search path or element

Affects GS Yuasa International FULLBACK Manager Pro (for Windows)Source CVE Database V5

Not known to be exploited · CVSS 6.7 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.0 base score

6.7Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector: Local
Attack Complexity: Low
Privileges Required: High
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: High: The attacker is authorized with (i.e., requires) privileges that provide significant (e.g., administrative) control over the vulnerable component that could affect component-wide settings and files.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 8 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
GS Yuasa International Ltd. FULLBACK Manager Pro (for Windows)	Affected <=4.00	Fixed in–

AI-suggested

European organizations should immediately audit the file system permissions of directories where FULLBACK Manager Pro is installed to ensure that only trusted administrators have write access. Removing write permissions for non-administrative users on these directories will prevent exploitation. Additionally, organizations should monitor for the release of official patches or updates from GS Yuasa International Ltd. and apply them promptly. As a temporary workaround, administrators can manually quote the service executable paths in the Windows service configuration using tools like 'sc config' or PowerShell to prevent path hijacking. Employing application whitelisting and endpoint protection solutions that detect unauthorized service modifications or suspicious executable placements can further reduce risk. Regularly reviewing and hardening local privilege assignments and employing the principle of least privilege will limit the potential for exploitation. Finally, educating IT staff about the risks of unquoted service paths and ensuring secure software installation practices will help prevent similar vulnerabilities.

Description

FULLBACK Manager Pro provided by GS Yuasa International Ltd.registers two Windows services with unquoted file paths. A user may execute arbitrary code with SYSTEM privilege if he/she has the write permission on the path to the directory where the affected product is installed.

Impact

For European organizations, this vulnerability poses a risk of local privilege escalation, potentially allowing attackers with limited access to gain full SYSTEM privileges. This can lead to unauthorized data access, system manipulation, or disruption of critical services. Organizations in manufacturing, industrial control, or sectors relying on GS Yuasa's FULLBACK Manager Pro may face operational disruptions or data breaches. The impact is particularly severe in environments where multiple users have write access to software installation directories, such as shared workstations or poorly managed endpoints. Given the high impact on confidentiality, integrity, and availability, exploitation could facilitate lateral movement, persistence, or deployment of ransomware. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers often target unquoted service path vulnerabilities due to their straightforward exploitation. European entities with strict regulatory requirements around data protection and operational continuity must address this vulnerability promptly to avoid compliance violations and reputational damage.

References

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