CVE-2026-23768: lucy-xss-filter before commit 7c1de6d allows an attacker to induce server-side HEAD requests to arbitrary URLs

Q: How do I fix CVE-2026-23768?

lucy-xss-filter: upgrade to 2025-06-08. Exact commands for each OS are on this page.

Q: Is CVE-2026-23768 being exploited?

CVE-2026-23768 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-23768 affect?

CVE-2026-23768 affects lucy-xss-filter. Severity is medium (CVSS 6.1). lucy-xss-filter before commit 7c1de6d allows an attacker to induce server-side HEAD requests to arbitrary URLs when the ObjectSecurityListener or EmbedSecurityListener option is enabled and embed or object tags are used with a src attribute

Q: How urgent is CVE-2026-23768?

Priority 30/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2026-23768 is a medium-severity flaw (CVSS 6.1) affecting lucy-xss-filter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

lucy-xss-filter before commit 7c1de6d allows an attacker to induce server-side HEAD requests to arbitrary URLs when the ObjectSecurityListener or EmbedSecurityListener option is enabled and embed or object tags are used with a src attribute missing a file extension.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-01-16
Last modified	2026-06-17

Publisher (CNA): Naver Corporation · Vendor: naver

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-16 06:15 UTCPublished CVE record published
2026-06-17 10:22 UTCUpdated Record last modified

naver lucy-xss-filter UPGRADE

Affected: < 2025-06-08

Fixed in: 2025-06-08

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lucy-xss-filter || rpm -q lucy-xss-filter || lucy-xss-filter --version

2. UPGRADE to 2025-06-08 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lucy-xss-filter

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lucy-xss-filter

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-23768?

lucy-xss-filter: upgrade to 2025-06-08. Exact commands for each OS are on this page.

Is CVE-2026-23768 being exploited?

CVE-2026-23768 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-23768 affect?

CVE-2026-23768 affects lucy-xss-filter. Severity is medium (CVSS 6.1). lucy-xss-filter before commit 7c1de6d allows an attacker to induce server-side HEAD requests to arbitrary URLs when the ObjectSecurityListener or EmbedSecurityListener option is enabled and embed or object tags are used with a src attribute

How urgent is CVE-2026-23768?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2026-23769 MEDIUM 6.1 UPGRADE lucy-xss-filter before commit e5826c0 allows an attacker to execute malicious JavaScript due to improper sanit

References

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