{"schema":"record/v1","id":"art_01M5NBJZ8SKSDP3VK6EHSS4JZJ","type":"article","revision":1,"etag":"\"r1.s0\"","title":"ComfyUI security (Jul 2026 advisories): four high-severity flaws fixed in v0.28.0 - why an exposed ComfyUI must be patched and kept off the open network","summary":"Four GitHub security advisories published 2026-07-15 for Comfy-Org/ComfyUI, all affecting versions before 0.28.0 and fixed in 0.28.0: two stored cross-site-scripting issues (CVSS 8.2) where uploaded SVG/HTML files could be served inline from the ComfyUI origin (/view and /userdata endpoints), and two path-traversal issues (CVSS 7.5) - one through a crafted workflow submitted to the unauthenticated POST /prompt API via LoadImage-type nodes, one through the model-preview endpoint - allowing reads of files outside intended folders. The advisories note uploads and /prompt are unauthenticated by default. Practical guidance (no exploit details reproduced): update to a current release (latest reviewed here v0.42.1, C3-B396-01); do not expose ComfyUI on public interfaces (avoid --listen 0.0.0.0 without an authenticating proxy, per the earlier ComfyUI --listen security answer); treat shared workflow JSON from strangers as untrusted input; for organisations, combine with the new custom-node g...","status":"active","body":{"text":"Four GitHub security advisories published 2026-07-15 for Comfy-Org/ComfyUI, all affecting versions before 0.28.0 and fixed in 0.28.0: two stored cross-site-scripting issues (CVSS 8.2) where uploaded SVG/HTML files could be served inline from the ComfyUI origin (/view and /userdata endpoints), and two path-traversal issues (CVSS 7.5) - one through a crafted workflow submitted to the unauthenticated POST /prompt API via LoadImage-type nodes, one through the model-preview endpoint - allowing reads of files outside intended folders. The advisories note uploads and /prompt are unauthenticated by default. Practical guidance (no exploit details reproduced): update to a current release (latest reviewed here v0.42.1, C3-B396-01); do not expose ComfyUI on public interfaces (avoid --listen 0.0.0.0 without an authenticating proxy, per the earlier ComfyUI --listen security answer); treat shared workflow JSON from strangers as untrusted input; for organisations, combine with the new custom-node governance option (C3-B397-03). This complements prior custom-node supply-chain warnings.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Advisory summaries; affected/fixed versions as stated by the advisories; not tested.\n\nLimitations: Summaries only; versions as stated by advisories; not tested.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/Comfy-Org/ComfyUI/security/advisories/GHSA-rvxv-29p8-pxgq","note":"summary; summary"},{"url":"https://github.com/Comfy-Org/ComfyUI/security/advisories/GHSA-rj8c-c4p8-3c5h","note":"summary; summary"}]},"categories":["T08","T09"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://github.com/Comfy-Org/ComfyUI/security/advisories/GHSA-rvxv-29p8-pxgq","claim":"Four GitHub security advisories published 2026-07-15 for Comfy-Org/ComfyUI, all affecting versions before 0.28.0 and fixed in 0.28.0: two stored cross-site-scripting issues (CVSS 8.2) where uploaded SVG/HTML files could be served inline from the ComfyUI origin (/view and /userdata endpoints), and two path-traversal issues (CVSS 7.5) - one through a crafted workflow submitted to the unauthenticated POST /prompt API via LoadImage-type nodes, one through the model-preview endpoint - allowing reads of files outside intended folders. The advisories note uploads and /prompt are unauthenticated by default. Practical guidance (no exploit details reproduced): update to a current release (latest reviewed here v0.42.1, C3-B396-01); do not expose ComfyUI on public interfaces (avoid --listen 0.0.0.0 without an authenticating proxy, per the earlier ComfyUI --listen security answer); treat shared workflow JSON from strangers as untrusted input; for organisations, combine with the new custom-node governance option (C3-B397-03). 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The advisories note uploads and /prompt are unauthenticated by default. Practical guidance (no exploit details reproduced): update to a current release (latest reviewed here v0.42.1, C3-B396-01); do not expose ComfyUI on public interfaces (avoid --listen 0.0.0.0 without an authenticating proxy, per the earlier ComfyUI --listen security answer); treat shared workflow JSON from strangers as untrusted input; for organisations, combine with the new custom-node governance option (C3-B397-03). This complements prior custom-node supply-chain warnings.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Advisory summaries; affected/fixed versions as stated by the advisories; not tested.\n\nLimitations: Summaries only; versions as stated by advisories; not tested.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/Comfy-Org/ComfyUI/security/advisories/GHSA-rvxv-29p8-pxgq","note":"summary; summary"},{"url":"https://github.com/Comfy-Org/ComfyUI/security/advisories/GHSA-rj8c-c4p8-3c5h","note":"summary; summary"}]},"tags":[],"type":"article","links":[],"title":"ComfyUI security (Jul 2026 advisories): four high-severity flaws fixed in v0.28.0 - why an exposed ComfyUI must be patched and kept off the open network","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Four GitHub security advisories published 2026-07-15 for Comfy-Org/ComfyUI, all affecting versions before 0.28.0 and fixed in 0.28.0: two stored cross-site-scripting issues (CVSS 8.2) where uploaded SVG/HTML files could be served inline from the ComfyUI origin (/view and /userdata endpoints), and two path-traversal issues (CVSS 7.5) - one through a crafted workflow submitted to the unauthenticated POST /prompt API via LoadImage-type nodes, one through the model-preview endpoint - allowing reads of files outside intended folders. The advisories note uploads and /prompt are unauthenticated by default. Practical guidance (no exploit details reproduced): update to a current release (latest reviewed here v0.42.1, C3-B396-01); do not expose ComfyUI on public interfaces (avoid --listen 0.0.0.0 without an authenticating proxy, per the earlier ComfyUI --listen security answer); treat shared workflow JSON from strangers as untrusted input; for organisations, combine with the new custom-node g...","evidence":{"claims":[{"url":"https://github.com/Comfy-Org/ComfyUI/security/advisories/GHSA-rvxv-29p8-pxgq","claim":"Four GitHub security advisories published 2026-07-15 for Comfy-Org/ComfyUI, all affecting versions before 0.28.0 and fixed in 0.28.0: two stored cross-site-scripting issues (CVSS 8.2) where uploaded SVG/HTML files could be served inline from the ComfyUI origin (/view and /userdata endpoints), and two path-traversal issues (CVSS 7.5) - one through a crafted workflow submitted to the unauthenticated POST /prompt API via LoadImage-type nodes, one through the model-preview endpoint - allowing reads of files outside intended folders. The advisories note uploads and /prompt are unauthenticated by default. Practical guidance (no exploit details reproduced): update to a current release (latest reviewed here v0.42.1, C3-B396-01); do not expose ComfyUI on public interfaces (avoid --listen 0.0.0.0 without an authenticating proxy, per the earlier ComfyUI --listen security answer); treat shared workflow JSON from strangers as untrusted input; for organisations, combine with the new custom-node governance option (C3-B397-03). 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