CVE-2026-33071Public exploitNetwork attack vector

Authenticated file write via unvalidated WebDAV filenames

Published Mar 20, 2026 · Updated Mar 20, 2026

Unrestricted file upload in error311 FileRise before 3.8.0 allows remote authenticated users to write dangerous files through WebDAV. The WebDAV createFile() and put() methods use client-supplied filenames without applying the REGEX_FILE_NAME policy enforced by the regular upload path. Default Docker Apache rules block direct execution, while nginx or weakened Apache deployments execute uploaded PHP files as remote code.

CVSS severity4.3
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in error311 FileRise before 3.8.0 allows remote authenticated users to write dangerous files through WebDAV. The WebDAV createFile() and put() methods use client-supplied filenames without applying the REGEX_FILE_NAME policy enforced by the regular upload path. Default Docker Apache rules block direct execution, while nginx or weakened Apache deployments execute uploaded PHP files as remote code.

The record

CVE
CVE-2026-33071
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
error311
Product
FileRise
Classifications
CWE-552, CWE-434, T1105
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

error311 · FileRiseversion=< 3.8.0

Published CVSS scores

8.8NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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.

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-552Files or Directories Accessible to External Parties
CWE-434Unrestricted Upload of File with Dangerous Type
T1105Ingress Tool Transfer

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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