CVE-2026-42535Network attack vector

Authenticated database tampering via path handling

Published Jun 8, 2026 · Updated Jun 8, 2026

Path handling in mod_dav_fs in Apache HTTP Server 2.4.67 and earlier allows remote authenticated users to alter DAV property databases. Apache has not disclosed the specific path operation or code locus that exposes trusted database files to author-controlled requests. Exploitation requires WebDAV authoring access and can crash child processes, interrupting requests handled by those processes.

CVSS severity9.1
Critical
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path handling in mod_dav_fs in Apache HTTP Server 2.4.67 and earlier allows remote authenticated users to alter DAV property databases. Apache has not disclosed the specific path operation or code locus that exposes trusted database files to author-controlled requests. Exploitation requires WebDAV authoring access and can crash child processes, interrupting requests handled by those processes.

The record

CVE
CVE-2026-42535
Published
Jun 8, 2026
Updated
Jun 8, 2026
Vendor
The Apache Software Foundation
Product
Apache HTTP Server
Classifications
CWE-668, T1565.001, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 8, 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 <=2.4.67

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache HTTP Serverversion=0 <=2.4.67

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
T1565.001Stored Data Manipulation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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