CVE-2026-40544

MEDIUMNVD 5.15.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.1 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 79% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
5.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
5.1
EG Score
5.1(medium)
EPSS
21.4%
KEV
Not listed

Published

June 1, 2026

Last Modified

June 1, 2026

Advisory Details (2)

Auto-updated Jun 15, 2026
No patch confirmed yet.
generic

Online Planning tool - SO Planning Shared Planning Software

https://www.soplanning.org/en/
generic

Vulnerabilities in SOPlanning software | CERT Polska

https://cert.pl/en/posts/2026/06/CVE-2026-40543

Vendor Advisories for CVE-2026-40544(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Frequently asked(5)

What is CVE-2026-40544?
CVE-2026-40544 is a medium vulnerability published on June 1, 2026. 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…
When was CVE-2026-40544 disclosed?
CVE-2026-40544 was first published in the National Vulnerability Database on June 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40544 actively exploited?
CVE-2026-40544 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40544?
CVE-2026-40544 has a CVSS v3 base score of 5.1 (NVD).
How do I remediate CVE-2026-40544?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40544, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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