CVE-2026-40544 Stored XSS in SOPlanning
An authenticated attacker can inject malicious JavaScript via a crafted backup file, leading to code execution in victims' browsers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-40544?
CVE-2026-40544 is a medium-severity cross-site scripting vulnerability in SOPlanning, published on 1 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-40544?
How do I fix CVE-2026-40544?
No fix has been published for CVE-2026-40544 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-40544 being exploited?
There is no known exploitation of CVE-2026-40544 in the wild and no public exploit code.
Sources
Also known as GHSA-hgm3-4mgq-cfx8.