CVE-2026-40544
MEDIUM EPSS 21.1%
Published Jun 1, 20264w ago · Modified Jun 17, 20261w ago
5.1 CVSS 4.0
Published Jun 1, 2026 4w ago
Last Modified Jun 17, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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/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 Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction P
Scope X
Threat Intelligence
EPSS Exploit Probability
21.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-79 Cross-site Scripting Injection
References 2
- cert.pl https://cert.pl/en/posts/2026/06/CVE-2026-40543
- soplanning.org https://www.soplanning.org/en/
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.