CVE-2026-77814 is an improper pathname restriction vulnerability in zanllp Infinite Image Browsing affecting versions up to and including 1.8.0. The flaw is in is_path_trusted in scripts/iib/api.py, which validates a requested path against allowed parent directories using a raw prefix comparison with path.startswith(parent_path). Because the check does not require a path separator boundary, paths located in sibling directories whose names merely begin with an allowed directory name are incorrectly treated as trusted. As a result, files outside the intended confined directory set can be returned through the application's file-serving logic. The issue is particularly relevant when Infinite Image Browsing is used with Stable Diffusion WebUI deployments that rely on the access-control behavior governed by get_enable_access_control in scripts/iib/tool.py.
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