CVE-2025-15104Public exploitNetwork attack vector

Unauthenticated SSRF via hostname-only destination filtering

Published Jan 16, 2026 · Updated Jan 16, 2026

Server-side request forgery in Nu Html Checker through 26.1.11 allows remote attackers to access internal HTTP/HTTPS services. The URL validator compares literal host strings against a blocklist without resolving and rejecting loopback or private destination addresses. An unauthenticated doc URL request or attacker-controlled external entity can therefore reach localhost and other internal services on permitted ports.

CVSS severity6.9
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Nu Html Checker through 26.1.11 allows remote attackers to access internal HTTP/HTTPS services. The URL validator compares literal host strings against a blocklist without resolving and rejecting loopback or private destination addresses. An unauthenticated doc URL request or attacker-controlled external entity can therefore reach localhost and other internal services on permitted ports.

The record

CVE
CVE-2025-15104
Published
Jan 16, 2026
Updated
Jan 16, 2026
Vendor
Nu Html Checker
Product
Nu Html Checker
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 16, 2026Record 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=latest - commit:23f090a11bab8d0d4e698f1ffc197a4fe226a9cd

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nu Html Checker · Nu Html Checkerversion=latest - commit:23f090a11bab8d0d4e698f1ffc197a4fe226a9cd

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.5GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:P
6.9Fluid AttacksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

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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