What is CVE-2025-11147?

CVE-2025-11147 is a medium-severity vulnerability in Apt-Cacher-Ng, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-09-29.

How severe is CVE-2025-11147?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Apt-Cacher-Ng

CVE-2025-11147

Reflected cross-site scripting (XSS) in Apt-Cacher-NG v3.2.1. The vulnerability allows malicious scripts (XSS) to be executed in “/html/<filename>.html”.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2025-09-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (6.3th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.3% 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: 0.000

Affected products

Apt-Cacher-Ng — versions 3.2.1
Apt-Cacher-Ng Project — versions 3.2-1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-apt-cacher-… (Third Party Advisory)

Frequently asked questions

What is CVE-2025-11147?: CVE-2025-11147 is a medium-severity vulnerability in Apt-Cacher-Ng, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-09-29.
How severe is CVE-2025-11147?: Medium severity. CVSS v3 base score is 5.4 out of 10.