EUVD-2026-67576
GHSA-p9g2-m7rg-67r7
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-accessible stored XSS requiring a low-privileged account and victim page view; scope change captures cross-user session impact with low confidentiality and integrity consequences.
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
Stored or persistent cross-site scripting in SOY Calendar by Tsuyoshi Saito allows a low-privileged authenticated attacker to inject arbitrary JavaScript that executes in other logged-in users' browsers. The CVSS scope change (S:C) confirms the payload crosses a security boundary, targeting victim sessions rather than the attacker's own context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold at minimum a low-privileged authenticated account on the target SOY Calendar installation, as confirmed by CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.4 Medium score accurately reflects the constrained attack surface: exploitation requires a low-privileged authenticated account (PR:L) and a separate victim user to view the malicious content (UI:R), preventing fully automated mass exploitation. … 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 for patch details and upgrade instructions, as no specific patched version number is independently confirmed from 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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