# CVE-2026-40545: SOPlanning Reflected XSS in taches parameter

Source: https://junglewise.ai/threats/cve-2026-40545-soplanning-reflected-xss-in-taches-parameter  
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-2026-40545 · Severity: info · CVSS 5.1 · Published 2026-06-01

SOPlanning, an online project management and team scheduling tool, is vulnerable to a security flaw that could allow an attacker to execute malicious code in a user's browser. By tricking an authenticated user into clicking a specially crafted link, an attacker can steal session information or perform actions on behalf of that user. This could lead to unauthorized access to project schedules, resource management data, and other sensitive team information.

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

## Quick answers

**Is CVE-2026-40545 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40545 being exploited in the wild.

**How severe is CVE-2026-40545?** Informational severity, with a CVSS score of 5.1, published 1 June 2026.

**Which products and versions are affected?** SOPlanning All through 1.55.

**Is there a fix for CVE-2026-40545?** 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-2026-40545 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-40545?** 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

A Reflected Cross-Site Scripting (XSS) vulnerability exists in SOPlanning versions up to and including 1.55. The vulnerability is located in the 'taches' parameter, which fails to properly neutralize user-supplied input before rendering it in a web page. An unauthenticated remote attacker can exploit this by crafting a malicious URL and using social engineering to entice an authenticated victim to click it. Successful exploitation allows the execution of arbitrary JavaScript within the victim's browser session, potentially leading to session hijacking or unauthorized administrative actions. The issue was coordinated and disclosed by CERT Polska.

## Affected products

- SOPlanning SOPlanning All through 1.55

## Timeline

- 2026-06-01: disclosed: Vulnerability disclosed by CERT Polska
- 2026-06-01: advisory: NVD record 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 unrestricted file upload in backup functionality](https://junglewise.ai/threats/cve-2026-40548-soplanning-unrestricted-file-upload-in-backup-functionality)
- [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)