Vulnerability · Published Aug 28, 2026 · Assigned by jpcert
CVE-2026-77838
Medium 5.4
In plain English
A medium-severity cross-site scripting in SOY Calendar from Tsuyoshi Saito. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Severity (CVSS 3.0)5.4Medium
Exploit odds (30 days)0.2%top 85.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Tsuyoshi Saito | SOY Calendar | o – through 2.4.0 |
Weakness: CWE-79 · Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N