PYSEC-2026-4028
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/chainlit/PYSEC-2026-4028.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-4028
- Aliases
- Published
- 2026-10-01T16:38:28Z
- Modified
- 2026-10-01T17:45:05Z
- 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
- 9.1 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Chainlit contains a session hijacking vulnerability
- Details
-
Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated user sessions by presenting a valid sessionId during WebSocket session restoration without ownership verification. Attackers can exploit the restore_existing_session path to assume a victim's permissions and roles, enabling unauthorized invocation of tools and access to data restricted to the authenticated victim.
- References
-
- https://nvd.nist.gov/vuln/detail/CVE-2026-56104
- https://github.com/Chainlit/chainlit/pull/2857
- https://github.com/Chainlit/chainlit/commit/5effb664f1e0af4a4f0a42fe63ea979676039a7f
- https://github.com/Chainlit/chainlit
- https://github.com/Chainlit/chainlit/releases/tag/2.10.1
- https://www.vulncheck.com/advisories/chainlit-session-hijacking-via-websocket-session-restoration
- https://pypi.org/project/chainlit
- https://github.com/advisories/GHSA-c39v-8hrw-h448
Affected packages
PyPI / chainlit
Package
- Name
- chainlit
- View open source insights on deps.dev
- Purl
- pkg:pypi/chainlit
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed2.10.1
Affected versions
0.*
0.1.0
0.1.1
0.1.101
0.1.102
0.1.103
0.2.0
0.2.1
0.2.101
0.2.102
0.2.103
0.2.104
0.2.105
0.2.106
0.2.107
0.2.108
0.2.109
0.2.110
0.2.111
0.3.0
0.4.0
0.4.1
0.4.2
0.4.3
0.4.101
0.5.0
0.5.1
0.5.2
0.6.0
0.6.1
0.6.2
0.6.3
0.6.4
0.6.401
0.6.402
0.7.0
0.7.1
0.7.2
0.7.3
0.7.301
0.7.400
0.7.500
0.7.501
0.7.600rc0
0.7.600rc1
0.7.601rc0
0.7.602rc0
0.7.602
0.7.603
0.7.604rc0
0.7.604rc1
0.7.604rc2
0.7.604
0.7.700
1.*
1.0.0rc0
1.0.0rc1
1.0.0rc2
1.0.0rc3
1.0.0
1.0.100
1.0.101
1.0.200
1.0.300
1.0.301
1.0.400
1.0.401
1.0.500
1.0.501
1.0.502
1.0.503
1.0.504
1.0.505
1.0.506
1.1.0rc0
1.1.0rc1
1.1.0
1.1.101
1.1.200
1.1.201
1.1.202
1.1.300rc0
1.1.300rc1
1.1.300rc2
1.1.300rc3
1.1.300rc4
1.1.300rc5
1.1.300
1.1.301
1.1.302
1.1.303
1.1.304
1.1.305
1.1.306
1.1.400rc0
1.1.400rc1
1.1.400
1.1.401
1.1.402
1.1.403rc0
1.1.404
1.2.0rc0
1.2.0
1.3.0rc0
1.3.0rc1
1.3.0
1.3.1
1.3.2
2.*
2.0.dev0
2.0.dev1
2.0.dev2
2.0rc0
2.0rc1
2.0.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.0.601
2.0.602
2.0.603
2.1.0
2.1.1
2.1.2
2.2.0
2.2.1
2.3.0
2.4.0rc0
2.4.0
2.4.1
2.4.2
2.4.3
2.4.201
2.4.301
2.4.302
2.4.400
2.5.5
2.6.0
2.6.1
2.6.2
2.6.3
2.6.4
2.6.5
2.6.6
2.6.7
2.6.8
2.6.9
2.7.0
2.7.1
2.7.1.1
2.7.2
2.8.0
2.8.1
2.8.2
2.8.3
2.8.4
2.8.5
2.9.0
2.9.1
2.9.2
2.9.3
2.9.4
2.9.5
2.9.6
2.10.0