EUVD-2026-56138
GHSA-q6c7-vm4c-28mj
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Endpoint is network-reachable via HTTP with no authentication (AV:N/PR:N/AC:L); arbitrary file write drives high integrity impact and disk exhaustion drives high availability impact, with no direct confidentiality exposure.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
AVideo contains an unauthenticated arbitrary file write vulnerability in the aVideoEncoderChunk.json.php endpoint that allows remote attackers to write up to 4 GB of arbitrary content to the server filesystem via HTTP PUT requests without authentication. Attackers can exhaust disk space causing denial of service, poison the video encoding pipeline, or chain this with local file inclusion to achieve remote code execution.
AnalysisAI
Unauthenticated arbitrary file write in AVideo's aVideoEncoderChunk.json.php endpoint allows remote attackers to write up to 4 GB of arbitrary content to the server filesystem via HTTP PUT requests, requiring no credentials of any kind. All AVideo versions (cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*) with this endpoint network-exposed are affected, as confirmed by the patch commit diff which shows authentication gating was entirely absent prior to the fix. Exploitation can cause denial of service via disk exhaustion, corrupt the video encoding pipeline, or - when chained with a local file inclusion vulnerability - escalate to remote code execution; no public exploit has been identified at time of analysis.
Technical ContextAI
AVideo is a self-hosted, open-source PHP video platform maintained by WWBN on GitHub. The vulnerable component, objects/aVideoEncoderChunk.json.php, is an internal endpoint designed to accept chunked video data written back by the AVideo encoder daemon via HTTP PUT. Prior to the patch, this endpoint contained zero authentication logic - it accepted and wrote arbitrary request body data directly to the server filesystem without validating any credential, token, or session. CWE-306 (Missing Authentication for Critical Function) precisely describes the root cause: a write-primitive endpoint, callable over the network, that performed no identity verification before executing a privileged filesystem operation. The patch at commit 1b55a9b3c4911d2f31594ce2e60566c70c6b95e8 retrofits two auth paths: a time-limited cryptographic upload token (X-Encoder-Upload-Token header, validated via verifyToken() without a database connection) and a fallback credential path using X-Encoder-User/X-Encoder-Pass headers validated via useVideoHashOrLogin() and User::canUpload(). The patch also adds a 32 GB assembled-file size cap with per-chunk enforcement.
RemediationAI
Apply the upstream fix at commit 1b55a9b3c4911d2f31594ce2e60566c70c6b95e8 (https://github.com/WWBN/AVideo/commit/1b55a9b3c4911d2f31594ce2e60566c70c6b95e8); note that a specific patched release version number is not confirmed from available data - this is a commit-level fix, and operators should verify whether a tagged release incorporating it has been published. As an immediate compensating control, restrict HTTP PUT requests to /objects/aVideoEncoderChunk.json.php at the web server or WAF layer, allowing only the encoder host's IP address; trade-off is that this will break legitimate remote encoding workflows if the encoder runs on a separate host. A second option is to require HTTP authentication at the reverse proxy layer in front of the entire AVideo installation, which adds an auth barrier but may conflict with encoder automation. Full advisory details and patch references are at https://github.com/WWBN/AVideo/security/advisories/GHSA-v7p7-jccx-h37c.
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External POC / Exploit Code
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