What is CVE-2026-30578?

CVE-2026-30578 is a medium-severity vulnerability in Leefish File Thingie, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2026-03-20.

How severe is CVE-2026-30578?

Medium severity. CVSS v3 base score is 6.5 out of 10.

XSS in Leefish File Thingie

CVE-2026-30578

File Thinghie 2.5.7 is vulnerable to Cross Site Scripting (XSS). A malicious user can leverage the "dir" parameter of the GET request to invoke arbitrary javascript code.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-03-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (13.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001

Affected products

Leefish File Thingie — versions 2.5.7

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/leefish/filethingie (Product)
github.com/SpeWnz/Vulnerability-Research/tree/main/CVE-2026-30578 (Third Party Advisory)

Frequently asked questions

What is CVE-2026-30578?: CVE-2026-30578 is a medium-severity vulnerability in Leefish File Thingie, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2026-03-20.
How severe is CVE-2026-30578?: Medium severity. CVSS v3 base score is 6.5 out of 10.