CVE-2026-23768Public exploitNetwork attack vector

Server-side HEAD requests via MIME type lookup

Published Jan 16, 2026 · Updated Jan 16, 2026

SSRF in NAVER Corporation Lucy-XSS Filter before commit 7c1de6d allows remote attackers to send HEAD requests to arbitrary URLs. The checkVulnerableWithHttp method resolves a missing file extension by opening the untrusted src URL to infer its MIME type. The ObjectSecurityListener or EmbedSecurityListener must be enabled; resulting requests can probe internal services and disclose the server's Java version.

CVSS severity6.1
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in NAVER Corporation Lucy-XSS Filter before commit 7c1de6d allows remote attackers to send HEAD requests to arbitrary URLs. The checkVulnerableWithHttp method resolves a missing file extension by opening the untrusted src URL to infer its MIME type. The ObjectSecurityListener or EmbedSecurityListener must be enabled; resulting requests can probe internal services and disclose the server's Java version.

The record

CVE
CVE-2026-23768
Published
Jan 16, 2026
Updated
Jan 16, 2026
Vendor
NAVER Corporation
Product
Lucy-XSS Filter
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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NAVER Corporation · Lucy-XSS FilterAffected versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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.

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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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