PYSEC-2026-4043

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Import Source

https://github.com/pypa/advisory-database/blob/main/vulns/djust/PYSEC-2026-4043.yaml

JSON Data

https://api.osv.dev/v1/vulns/PYSEC-2026-4043

Aliases

Published

2026-10-01T16:38:31Z

Modified

2026-10-01T17:45:02Z

Severity

7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator

Summary

djust: SSE sessions are not bound to the authenticated user; the client-chosen session_id is the sole authorization capability (session hijack)

Details

Impact

SSE sessions were keyed solely by a client-chosen session_id with no binding to the authenticated user — a control the WebSocket transport has but that was dropped on SSE. An attacker who learns (or a victim who leaks) a session_id could connect to the message endpoint and dispatch event handlers that execute with the victim's identity and state.

Patches

Fixed in djust 1.0.7. Each SSE session is bound to its owning principal at creation and cross-principal access is rejected; SSE session creation is additionally capped per principal.

Workarounds

Disable the SSE transport short of upgrading.

References

Affected packages

PyPI / djust

Package

Name: djust; View open source insights on deps.dev
Purl: pkg:pypi/djust

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.0.7

Affected versions

0.*

0.1.0

0.1.2

0.1.3

0.1.4

0.1.5

0.1.6

0.1.7

0.1.8

0.1.9

0.2.0

0.2.1

0.2.2

0.3.0

0.3.1

0.3.2

0.3.4

0.3.5

0.3.6

0.3.7

0.3.8

0.4.0

0.4.1

0.4.2

0.4.3

0.4.4

0.9.0

0.9.1

0.9.2

0.9.4

0.9.5

0.9.6

0.9.7

1.*

1.0.0rc11

1.0.0

1.0.1

1.0.2

1.0.3

1.0.4

1.0.5

1.0.6

Database specific

source

"https://github.com/pypa/advisory-database/blob/main/vulns/djust/PYSEC-2026-4043.yaml"