EUVD-2026-67577
GHSA-8559-r562-94j2
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/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
Network-delivered XSS requiring low-privilege attacker account and victim page load; scope change reflects cross-context browser execution; no availability impact.
Primary rating from Vendor (jpcert).
CVSS VectorVendor: jpcert
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Cross-site scripting in SOY Calendar (by Tsuyoshi Saito) enables a remote attacker holding a low-privilege account to inject arbitrary JavaScript that executes within the browser session of other logged-in users. The CVSS scope-change indicator (S:C) confirms the injected script breaks out of the application's own security boundary, elevating the practical risk beyond the medium base score. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must possess at least a low-privilege authenticated account on the SOY Calendar application (confirmed by PR:L in the CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.0 base score of 5.4 (Medium) reflects a balanced set of signals: network reachability and low attack complexity are offset by the requirements for attacker authentication (PR:L) and victim interaction (UI:R), and impact is bounded to limited confidentiality and integrity with no availability effect. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Consult the vendor advisory at https://saitodev.co/article/7105 and JVN advisory JVN#04485476 at https://jvn.jp/en/jp/JVN04485476/ for a patched release - an exact fixed version is not confirmed in the available intelligence. … Detailed patch versions, workarounds, and compensating controls in full report. |
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More in Soy Calendar
View allSame weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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