CVE-2026-45233Public exploitNetwork attack vector

Authenticated file relocation via path traversal

Published Jun 25, 2026 · Updated Jun 25, 2026

Path traversal in HTMLy through 3.1.1 allows remote authenticated users to move arbitrary server-writable files via the admin autosave endpoint. The /admin/autosave route passes the client-controlled oldfile value to file_exists() and rename() without canonicalization, ownership checks, or a content-directory boundary. Any low-privileged author account can target files writable by the web server process, causing unauthorized relocation or service interruption.

CVSS severity7.2
High
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in HTMLy through 3.1.1 allows remote authenticated users to move arbitrary server-writable files via the admin autosave endpoint. The /admin/autosave route passes the client-controlled oldfile value to file_exists() and rename() without canonicalization, ownership checks, or a content-directory boundary. Any low-privileged author account can target files writable by the web server process, causing unauthorized relocation or service interruption.

The record

CVE
CVE-2026-45233
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
Danang Probo Sayekti
Product
HTMLy
Classifications
CWE-22, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=0 <=3.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Danang Probo Sayekti · HTMLyversion=0 <=3.1.1

Published CVSS scores

7.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
8.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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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