CVE-2026-73827
Deferred Deferred - Pending Action

Cross-Site Scripting (XSS) in SOY Calendar

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: JPCERT/CC

Description
SOY Calendar contains a cross-site scripting vulnerability. An arbitrary script may be executed on the web browser of the user who is logging in to the product.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-09-17
AI Q&A
2026-08-28
EPSS Evaluated
2026-09-15
NVD
CVE-2026-73827
EUVD
EUVD-2026-67576

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
tsuyoshi_saito soy_calendar to 2.5.0 (exc)
tsuyoshi_saito soy_calendar 2.5.0
tsuyoshi_saito soy_cms 3.25.0
tsuyoshi_saito soy_gallery 2.1.0
tsuyoshi_saito soy_inquiry 2.11.0
tsuyoshi_saito soy_shop 2.15.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

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Executive Summary

CVE-2026-73827 is a Cross-site Scripting (XSS) vulnerability in SOY Calendar versions 2.4.0 and earlier. It allows an attacker to inject malicious scripts that execute in the web browser of users who log in to the product.

Detection Guidance

To detect this XSS vulnerability in SOY Calendar, check the installed version of SOY Calendar. If it is version 2.4.0 or earlier, the system is vulnerable. Use commands like 'grep' to inspect version details in files or database entries. For example, check version strings in configuration files or database records.

Impact Analysis

This vulnerability could allow attackers to steal user session cookies, perform actions on behalf of logged-in users, or deface the website. Users logging into the affected SOY Calendar may unknowingly execute malicious scripts.

Compliance Impact

XSS vulnerabilities can lead to unauthorized data access or modification, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations may face compliance penalties if user data is compromised due to this flaw.

Mitigation Strategies

Immediately update SOY Calendar to version 2.5.0 or later. Also update related SOY products (SOY CMS, SOY Gallery, SOY Inquiry, SOY Shop) to their latest versions as per the developer's instructions. Download updates from the official distribution page at https://saitodev.co/soycms/ and follow the provided update instructions.

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