CVE-2026-40544
Stored XSS in SOPlanning
- State
- Published
- Severity
- 5.1 Medium
- Published
- Jun 1, 2026
- Updated
- Jun 1, 2026
- Reserved
- Apr 14, 2026
Description
SOPlanning is vulnerable to Stored Cross-Site Scripting (XSS) via /process/upload_backup endpoint. An authenticated attacker with access to the backup functionality can upload a crafted ZIP archive containing a malicious user.csv file with embedded JavaScript. The injected code is executed in the victim’s browser when a user clicks the Edit button for the malicious backup.
This issue affects SOPlanning version 1.55 and below.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N | CERT-PL |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
SOPlanningSOPlanning |
|
References
- https://cert.pl/en/posts/2026/06/CVE-2026-40543third-party-advisory
- https://www.soplanning.org/en/product
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