CVE-2026-64940
Received Received - Intake

Permissive Regex Login Bypass in Tegalog -Fumy Otegaru Memo Logger

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: JPCERT/CC

Description
Tegalog -Fumy Otegaru Memo Logger- provided by Nishishi Factory contains a vulnerability due to a permissive regular expression, which may allow an attacker who can access the affected product to log in to the management console. As a result, the attacker may perform any operations available from the management console.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-64940
EUVD
EUVD-2026-55081

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
nishishi_factory tegalog to 4.9.0 (exc)
nishishi_factory tegalog From 4.9.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-625 The product uses a regular expression that does not sufficiently restrict the set of allowed values.

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Executive Summary

Tegalog -Fumy Otegaru Memo Logger- contains a permissive regular expression vulnerability that allows an attacker with access to the product to log in to the management console and perform any available operations.

Detection Guidance

To detect this vulnerability, check the version of Tegalog installed on your system. If it is version 4.8.4 or earlier, the system is vulnerable. Compare the installed version against the latest version (4.9.0) available from the developer.

Impact Analysis

An attacker could gain unauthorized access to the management console, allowing them to perform any operations available through it, potentially leading to data breaches or system manipulation.

Compliance Impact

This vulnerability could lead to unauthorized access and data exposure, which may violate compliance requirements for GDPR (data protection) and HIPAA (health information security), potentially resulting in legal penalties or loss of certification.

Mitigation Strategies

Immediately update Tegalog to version 4.9.0 or later. After updating, use the 'Force logout all users' button in the management console to clear all active sessions. Overwrite the tegalog.cgi, fumycts.pl, and tegup.php files with the latest versions if manual update is required.

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