CVE-2026-53907

mediumCVSS 5.4covered by 1 sourcefirst seen 2026-07-01

MCO is vulnerable to Stored Cross‑Site Scripting (XSS) via the application logo upload functionality. An attacker with the ability to change the application logo can upload a crafted SVG file containing malicious JavaScript code that is executed when the logo is rendered or opened. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.

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Exploitation outlook

Low exploitation risk0.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-53907: MCO is vulnerable to Stored Cross‑Site Scripting (XSS) via the application logo upload functio…nvd · 2026-07-01

External references

NVD record for CVE-2026-53907

CVE.org record

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