What is CVE-2026-29859?

CVE-2026-29859 is a critical-severity vulnerability in Aapanel, classified under Cross-site Scripting. CVSS score: 9.8/10. Published 2026-03-18.

How severe is CVE-2026-29859?

Critical severity. CVSS v3 base score is 9.8 out of 10.

XSS in Aapanel

CVE-2026-29859

An arbitrary file upload vulnerability in aaPanel v7.57.0 allows attackers to execute arbitrary code via uploading a crafted file.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-03-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (54.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003

Affected products

Aapanel — versions 7.57.0

Weakness classification (CWE)

References

github.com/aapanel/aapanel (Product)
github.com/mbiesiad/vulnerability-research/tree/main/CVE-2026-29859 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-29859?: CVE-2026-29859 is a critical-severity vulnerability in Aapanel, classified under Cross-site Scripting. CVSS score: 9.8/10. Published 2026-03-18.
How severe is CVE-2026-29859?: Critical severity. CVSS v3 base score is 9.8 out of 10.