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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.

PUBLISHED Reserved 2026-05-21 | Published 2026-05-27 | Updated 2026-05-27 | Assigner VulnCheck




HIGH: 7.6CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

MEDIUM: 6.8CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Problem types

Session Fixation

Product status

Default status
affected

Any version before 6.15.0
affected

Credits

YU SUN finder

References

github.com/gradio-app/gradio/issues/13369 exploit

github.com/gradio-app/gradio/releases/tag/gradio@6.15.0 release-notes

github.com/gradio-app/gradio/issues/13369 technical-description

github.com/gradio-app/gradio/pull/13384 issue-tracking

github.com/...ommit/feb7237d01f359d2ad4ee42d00344e61692b3b39 patch

www.vulncheck.com/.../gradio-cookie-injection-via-shared-pro third-party-advisory

cve.org (CVE-2026-48545)

nvd.nist.gov (CVE-2026-48545)

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