CVE-2026-48545
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 7.6 HIGHCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/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/M
- EPSS
- 0.35% probability · 28th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-384
- Affected
- gradio project/gradio
- Source
- disclosure@vulncheck.com
References
- https://github.com/gradio-app/gradio/commit/feb7237d01f359d2ad4ee42d00344e61692b3b39Patch
- https://github.com/gradio-app/gradio/issues/13369Issue Tracking
- https://github.com/gradio-app/gradio/pull/13384Issue Tracking, Patch
- https://github.com/gradio-app/gradio/releases/tag/gradio%406.15.0Product, Release Notes
- https://www.vulncheck.com/advisories/gradio-cookie-injection-via-shared-proBroken Link
- https://github.com/gradio-app/gradio/issues/13369Issue Tracking
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.