Published:2026/09/10  Last Updated:2026/09/10

JVN#37476837
Multiple vulnerabilities in SHIRASAGI

Overview

SHIRASAGI provided by SHIRASAGI Project contains multiple vulnerabilities.

Products Affected

CVE-2026-81635

  • SHIRASAGI v1.14.0 to v1.20.2
CVE-2026-82582
  • SHIRASAGI v1.20.2 and earlier

Description

SHIRASAGI provided by SHIRASAGI Project contains multiple vulnerabilities listed below.

  • Cross-site scripting (CWE-79)
    • CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Base Score 5.1
    • CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Base Score 5.4
    • CVE-2026-81635
  • Authorization bypass (CWE-639)
    • CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N Base Score 5.3
    • CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Base Score 4.3
    • CVE-2026-82582

Impact

  • An arbitrary script may be executed on the web browser of a user who accesses a website using the affected product (CVE-2026-81635).
  • Unauthorized users may be able to retrieve files from the groupware's shared file feature (CVE-2026-82582).

Solution

Update the software
Update the software to the latest version according to the information provided by the developer.
The developer has released the following version that addresses these vulnerabilities.

  • SHIRASAGI v1.21.0

Vendor Status

Vendor Link
SHIRASAGI Project Cross-Site Scripting and Authorization Bypass Vulnerabilities in SHIRASAGI (Text in Japanese)

References

JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Credit

CVE-2026-81635
Tonosaki Aoba of Tokyo Denki University remote control Laboratory reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

CVE-2026-82582
Kuniyoshi Noguchi @KuniNogu remote control Laboratory reported these vulnerabilities to SHIRASAGI Project and IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Alert
JPCERT Reports
CERT Advisory
CPNI Advisory
TRnotes
CVE CVE-2026-81635
CVE-2026-82582
JVN iPedia JVNDB-2026-000130