{"apiVersion":"1.0","identifier":"CVE-2026-77815","description":"to_abs_path in scripts/iib/tool.py normalised the requested path with os.path.normpath, which collapses dot segments but does not resolve symbolic links. A symlink placed inside a scanned directory therefore satisfies the containment comparison performed by is_path_trusted in scripts/iib/api.py while pointing outside that directory, and FileResponse follows the link when serving the response, so a link created in an image directory and targeting a file such as /etc/passwd discloses that file. Whether the check applies depends on get_enable_access_control in scripts/iib/tool.py: it returns true when IIB_ACCESS_CONTROL is set to enable, false when set to disable, and otherwise true when the host Stable Diffusion WebUI was started with share, ngrok, listen or server_name, falling back to false. Confinement is therefore active in the network-exposed WebUI deployments that rely on it, while a standalone run with no such option serves every readable file regardless of this flaw. The fix resolves the path with os.path.realpath.","publishedAt":"2026-08-21T15:16:47","lastModifiedAt":"2026-08-26T18:17:03","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77815","cvssScore":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","epssProbability":0.0041,"riskScore":0.78,"affectedProduct":"Stable Diffusion WebUI","affectedVersions":"unknown","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-77815","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-77815","en":"https://www.redsauce.net/en/cves/CVE-2026-77815","fr":"https://www.redsauce.net/fr/cves/CVE-2026-77815","pt":"https://www.redsauce.net/pt/cves/CVE-2026-77815","de":"https://www.redsauce.net/de/cves/CVE-2026-77815","sk":"https://www.redsauce.net/sk/cves/CVE-2026-77815","el":"https://www.redsauce.net/el/cves/CVE-2026-77815"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-77815"}}