Staging Environment: Content and features may be unstable or change without notice.
Advisory details: pypa / gradio/PYSEC-2026-2178
Advisory ID pypa/gradio/PYSEC-2026-2178
Aliases CVE-2026-48545
GHSA-7hp7-4p35-3cx2
PYSEC-2026-2178
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 6.1
Risk 3.0
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv3.1 6.8 https://github.com/pypa/advisory-database/blob/main/vulns/gradio/PYSEC-2026-2178.yaml
Reference id Reference type URL
13369 Other https://github.com/gradio-app/gradio/issues/13369
13384 Bug https://github.com/gradio-app/gradio/pull/13384
feb7237d01f359d2ad4ee42d00344e61692b3b39 Other https://github.com/gradio-app/gradio/commit/feb7237d01f359d2ad4ee42d00344e61692b3b39
GHSA-7hp7-4p35-3cx2 https://github.com/advisories/GHSA-7hp7-4p35-3cx2
gradio%406.15.0 Other https://github.com/gradio-app/gradio/releases/tag/gradio%406.15.0
gradio-cookie-injection-via-shared-pro Advisory https://www.vulncheck.com/advisories/gradio-cookie-injection-via-shared-pro
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Found at https://github.com/pypa/advisory-database/blob/main/vulns/gradio/PYSEC-2026-2178.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-05-27T15:35:33Z/

Decision: Track*

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/48xxx/CVE-2026-48545.json

Source Advisory: vulnrichment/CVE-2026-48545

View SSVC decision tree 
[{'Exploitation': 'poc'},
 {'Automatable': 'no'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]