CVE-2025-11147Network attack vector

Reflected XSS via crafted HTML filename path

Published Sep 29, 2025 · Updated Sep 29, 2025

Reflected XSS in Apt-Cacher-NG 3.2.1 allows remote attackers to run script in a victim's browser through a crafted /html/ URL. The /html/.html handler places attacker-controlled path content into an HTML response without neutralizing executable markup. Exploitation requires a victim to open the crafted URL; injected script then runs in that browser's Apt-Cacher-NG origin, enabling page data access or modification.

CVSS severity5.1
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Apt-Cacher-NG 3.2.1 allows remote attackers to run script in a victim's browser through a crafted /html/ URL. The /html/.html handler places attacker-controlled path content into an HTML response without neutralizing executable markup. Exploitation requires a victim to open the crafted URL; injected script then runs in that browser's Apt-Cacher-NG origin, enabling page data access or modification.

The record

CVE
CVE-2025-11147
Published
Sep 29, 2025
Updated
Sep 29, 2025
Vendor
Apt-Cacher-NG
Product
Apt-Cacher-NG
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 29, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apt-Cacher-NG · Apt-Cacher-NGversion=3.2.1

Published CVSS scores

5.4National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1Spanish National Cybersecurity Institute, S.A. (INCIBE)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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