VulnerabilityPublished 20 Mar 2026

CVE-2026-33071: error311 FileRise · Unrestricted File Upload

Affects error311 FileRiseSource CVE Database V5

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Not known to be exploited · CVSS 4.3 Medium : upgrade to 3.8.0 when convenient.

Data as of 1 Nov 2026, 08:20 UTC

CVSS 3.1 base score

4.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.6% chance of exploitation in 30 days – higher than 50% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 3.8.0

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 20 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade FileRise and error311/FileRise to 3.8.0.

Affected software

Product	Affected	Fixed in
error311FileRise	Affected <3.8.0	Fixed in 3.8.0
GitHuberror311/FileRise`pkg:github/error311/FileRise`Other threats	Affected <3.8.0	Fixed in 3.8.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Organizations should immediately upgrade FileRise to version 3.8.0 or later, where the vulnerability is fixed by enforcing filename validation on the WebDAV upload endpoint. Until upgrading, administrators should implement strict Apache LocationMatch directives or equivalent web server configurations to prevent execution of uploaded files in the WebDAV directories. Restrict WebDAV access to trusted users and networks only, employing strong authentication and network segmentation. Monitor WebDAV upload directories for suspicious files, especially those with executable extensions like .php, .phtml, or .htaccess. Employ file integrity monitoring and intrusion detection systems to detect unauthorized uploads or execution attempts. Regularly audit server configurations to ensure that upload directories are not executable. Consider disabling WebDAV if not required or replacing it with more secure file transfer mechanisms. Finally, maintain up-to-date backups and incident response plans to recover quickly if exploitation occurs.

Description

CVE-2026-33071 is a medium severity vulnerability in FileRise versions prior to 3.8.0, a self-hosted web file manager and WebDAV server. The vulnerability arises because the WebDAV upload endpoint does not validate file extensions, allowing attackers to upload files with dangerous server-side executable extensions such as . php, . phtml, and . htaccess. This bypasses the filename validation enforced on the regular upload path. In deployments without Apache's LocationMatch protection, this can lead to remote code execution. The flaw is due to the createFile() and put() methods accepting filenames directly from WebDAV clients without validation.

Impact

The primary impact of this vulnerability is the potential for remote code execution on servers running vulnerable versions of FileRise without proper Apache LocationMatch protections. Successful exploitation would allow attackers to upload malicious server-side scripts that can be executed, compromising the confidentiality, integrity, and availability of the affected system. This could lead to unauthorized access, data theft, defacement, or further network pivoting. Organizations using FileRise as a web file manager or WebDAV server, especially those exposing it to the internet, face increased risk of compromise. Since the vulnerability requires low attack complexity and network access with some privileges, insider threats or attackers who have gained limited access could escalate their control. The lack of user interaction needed increases the risk of automated exploitation once an attacker gains access. However, the medium CVSS score reflects that exploitation requires some privileges and specific server configurations lacking Apache protections. The vulnerability could disrupt business operations, lead to data breaches, and damage organizational reputation if exploited.

CWE-434Unrestricted Upload of File with Dangerous Type (opens in a new tab)
Base weaknessLikelihood of exploit: MediumCWE Top 25 (2025): #12OWASP Top 10 A06:2025: Insecure Design (opens in a new tab)
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
Architecture and Design
Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.
Architecture and Design · Enforcement by Conversion
When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
Architecture and Design
Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically.
OWASP Cheat Sheets
Server Side Request Forgery Prevention (opens in a new tab)
Web Service Security (opens in a new tab)
Third Party Javascript Management (opens in a new tab)
File Upload (opens in a new tab)
Secure Design Principles (opens in a new tab)
OWASP ASVS 4.0.3
V12.5.2 (opens in a new tab)
V13.1.5 (opens in a new tab)
V12.2.1 (opens in a new tab)
Attack patterns
Accessing Functionality Not Properly Constrained by ACLs (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-552Files or Directories Accessible to External Parties (opens in a new tab)
Base weaknessOWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product makes files or directories accessible to unauthorized actors, even though they should not be.
Implementation · System Configuration · Operation
When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to disable public access.
OWASP Cheat Sheets
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V12.5.1 (opens in a new tab)
V12.4.1 (opens in a new tab)
V8.3.8 (opens in a new tab)
Attack patterns
Collect Data from Common Resource Locations (opens in a new tab)
Probe System Files (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 27 Mar 2026, 19:32 UTC

WeaknessesCWE-434, CWE-552

Technical details

References

Community reviews

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