CVE-2026-48545

Description

Gradio before version 6.15.0 contains a cookie injection vulnerability that allows remote attackers to perform cross-Space session fixation by exploiting a shared module-level HTTP client used across all users in the reverse proxy endpoint. Attackers controlling any HF Space can return a parent-domain cookie that the shared client stores and automatically replays into all subsequent proxy requests to other legitimate Spaces, affecting all users of the same Gradio deployment.

References

• https://github.com/gradio-app/gradio/commit/feb7237d01f359d2ad4ee42d00344e61692b3b39
• https://github.com/gradio-app/gradio/issues/13369
• https://github.com/gradio-app/gradio/pull/13384
• https://github.com/gradio-app/gradio/releases/tag/gradio%406.15.0
• https://www.vulncheck.com/advisories/gradio-cookie-injection-via-shared-pro