CVE-2026-48545: gradio Session Fixation — Fix

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.

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CVSS v3.1 Score

6.8

MEDIUM

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

EPSS — Exploit Prediction

0.0036

Probability of exploitation

0.27%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-384 CWE-384

Affected Products

Vendor	Product	Versions
gradio_project	gradio	< 6.15.0

References

Advisories & Patches

https://github.com/gradio-app/gradio/commit/feb7237d01f359d2ad4ee42d00344e61692b3b39 https://github.com/gradio-app/gradio/pull/13384

Other References

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

Frequently Asked Questions

What is 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. 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. It has a CVSS v3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2026-48545? +

CVE-2026-48545 has a CVSS v3.1 score of 6.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0036, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-48545? +

CVE-2026-48545 affects products from gradio_project, specifically: gradio. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-48545? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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