# CVE-2026-40548: SOPlanning unrestricted file upload in backup functionality

Source: https://junglewise.ai/threats/cve-2026-40548-soplanning-unrestricted-file-upload-in-backup-functionality  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-01. Updated: 2026-06-01  
License: CC BY 4.0 with a link back

CVE-2026-40548 · Severity: info · CVSS 6.4 · Published 2026-06-01

SOPlanning is an online project management and team scheduling tool. A security flaw in the backup system allows an authorized user to upload malicious files disguised within a backup archive. If combined with other known flaws, this could allow an attacker to take control of the server, potentially leading to data theft or service disruption.

Technologies: [SOPlanning](https://junglewise.ai/threats/technologies/soplanning). Vendors: [SOPlanning](https://junglewise.ai/threats/vendors/soplanning).

## Quick answers

**Is CVE-2026-40548 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40548 being exploited in the wild.

**How severe is CVE-2026-40548?** Informational severity, with a CVSS score of 6.4, published 1 June 2026.

**Which products and versions are affected?** SOPlanning 1.55 and below.

**Is there a fix for CVE-2026-40548?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-40548 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-40548?** Check whether you run SOPlanning at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

SOPlanning version 1.55 and below contains an unrestricted file upload vulnerability (CWE-434) in its backup functionality. The application does not validate the extensions of files contained within uploaded ZIP archives. An authenticated attacker with access to backup features can include a malicious file (such as a PHP script) alongside the expected 'user.csv' file. When combined with a path traversal vulnerability (CVE-2026-40547), the attacker can place the malicious file into a web-accessible directory and execute it, leading to remote code execution. Access to the backup functionality is required, which typically requires high privileges, though CVE-2026-40543 may allow unauthorized access to these endpoints.

## Affected products

- SOPlanning SOPlanning 1.55 and below

## Timeline

- 2026-06-01: disclosed: Vulnerability disclosed by CERT Polska
- 2026-06-01: advisory: CVE-2026-40548 published

## References

- [https://cert.pl/en/posts/2026/06/CVE-2026-40543](https://cert.pl/en/posts/2026/06/CVE-2026-40543)
- [https://www.soplanning.org/en/](https://www.soplanning.org/en/)

## Related threats

- [SOPlanning SQL injection in audit retention configuration](https://junglewise.ai/threats/cve-2026-50644-soplanning-sql-injection-in-audit-retention-configuration)
- [SOPlanning CSRF in groupe_save endpoints](https://junglewise.ai/threats/cve-2026-40549-soplanning-csrf-in-groupe-save-endpoints)
- [SOPlanning Path Traversal in backup endpoints](https://junglewise.ai/threats/cve-2026-40547-soplanning-path-traversal-in-backup-endpoints)
- [SOPlanning SQL injection in multiple endpoints](https://junglewise.ai/threats/cve-2026-40546-soplanning-sql-injection-in-multiple-endpoints)
- [SOPlanning Reflected XSS in taches parameter](https://junglewise.ai/threats/cve-2026-40545-soplanning-reflected-xss-in-taches-parameter)