VulnerabilityPublished 23 Mar 2026

CVE-2026-33717: WWBN AVideo · Unrestricted File Upload

Affects WWBN AVideoSource CVE Database V5

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Not known to be exploited · CVSS 8.8 High.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score

8.8High

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

EPSS: 0.4% chance of exploitation in 30 days – higher than 34% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

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

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: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 23 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 29 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

Affected software

Product	Affected	Fixed in
WWBNAVideo	Affected <=26.0	Fixed in–
GitHubwwbn/AVideo`pkg:github/wwbn/AVideo`Other threats	Affected <=26.0	Fixed in–

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

AI-suggested

To mitigate CVE-2026-33717, organizations should immediately upgrade WWBN AVideo to a version that includes the patch from commit 6da79b43484099a0b660d1544a63c07b633ed3a2 or later. If upgrading is not immediately possible, implement the following controls: 1) Restrict write permissions on the videos/cache/tmpFile/ directory to prevent execution of uploaded files; 2) Employ web server configuration to disable execution of PHP files in temporary upload directories; 3) Implement strict input validation and sanitization on parameters such as resolution to prevent triggering early termination; 4) Monitor the temporary directories for unexpected PHP or executable files and remove them promptly; 5) Enforce least privilege access for authenticated users to reduce exploitation risk; 6) Use web application firewalls (WAFs) to detect and block suspicious upload attempts; 7) Conduct regular security audits and penetration testing focused on file upload functionalities. These measures help reduce attack surface and prevent persistent malicious file uploads.

Description

CVE-2026-33717 is a high-severity vulnerability in WWBN AVideo versions up to 26.0 that allows attackers to upload and persistently store executable PHP files in a web-accessible directory. This occurs because the downloadVideoFromDownloadURL() function saves remote content using the original filename and extension without proper validation, and an attacker can trigger an early termination that prevents cleanup of the malicious file. Exploiting this flaw can lead to remote code execution, compromising confidentiality, integrity, and availability of the affected system. No user interaction is required, but low privilege authentication is needed. A patch has been committed to address this issue. Organizations running vulnerable versions should urgently update to mitigate risk. Countries with significant AVideo deployments and strategic interest in video platforms are most at risk.

Impact

The impact of CVE-2026-33717 is significant for organizations using WWBN AVideo versions 26.0 and earlier. Successful exploitation allows attackers to upload and execute arbitrary PHP code on the server, leading to full system compromise. This can result in unauthorized data access or exfiltration, defacement or manipulation of video content, deployment of malware or ransomware, and disruption of video services. Since the malicious files remain persistently accessible, attackers can maintain long-term presence and pivot within the network. The vulnerability affects confidentiality, integrity, and availability of the affected systems. Given the nature of video platforms, organizations relying on AVideo for content delivery, media hosting, or internal communications face reputational damage and operational downtime. The ease of exploitation combined with the high impact makes this a critical risk for affected deployments.

Summary

CVE-2026-33717 is a vulnerability classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) affecting WWBN AVideo, an open-source video platform. In versions up to and including 26.0, the function downloadVideoFromDownloadURL() in the file objects/aVideoEncoder.json.php downloads remote content and saves it to a temporary web-accessible directory named videos/cache/tmpFile/. The filename and extension are directly derived from the original URL, including potentially dangerous extensions like .php. An attacker can supply an invalid resolution parameter that triggers an early termination of the function via forbiddenPage(), which calls die() before the temporary file is moved or deleted. This results in the malicious PHP file remaining accessible under the web root, enabling remote code execution. The vulnerability requires the attacker to have low privilege authentication but does not require user interaction. The CVSS v3.1 score is 8.8, indicating high severity with network attack vector, low attack complexity, privileges required, no user interaction, and full impact on confidentiality, integrity, and availability. A patch has been committed (commit 6da79b43484099a0b660d1544a63c07b633ed3a2) to fix this issue by ensuring proper handling and cleanup of temporary files and validation of uploaded content.

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).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 30 Mar 2026, 20:33 UTC

WeaknessesCWE-434

Technical details

References

Community reviews

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