CVE-2026-56104

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Source
https://cve.org/CVERecord?id=CVE-2026-56104
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56104.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-56104
Aliases
Published
2026-06-22T14:17:52Z
Modified
2026-10-21T02:58:40Z
Severity
  • 8.8 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N CVSS Calculator
Summary
Chainlit < 2.10.1 Session Hijacking via WebSocket Session Restoration
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.

Database specific 
{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-862"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56104.json"
}
References

Affected packages

Git / github.com/chainlit/chainlit

Affected ranges

Type
GIT
Repo
https://github.com/chainlit/chainlit
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
1eb4fcabdd1c029b4035211baec3919939e6d57f
Fixed
5effb664f1e0af4a4f0a42fe63ea979676039a7f
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "2.10.1"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "original_tag":  "2.10.1",
            "range":  [
                {
                    "fixed":  "1eb4fcabdd1c029b4035211baec3919939e6d57f"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "range":  [
                {
                    "fixed":  "5effb664f1e0af4a4f0a42fe63ea979676039a7f"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

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
0.4.101
0.4.2
0.4.3
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
0.7.602
0.7.602rc0
0.7.603
0.7.604
0.7.604rc0
0.7.604rc1
0.7.604rc2
0.7.700
1.*
1.0.0
1.0.0rc0
1.0.0rc1
1.0.0rc2
1.0.0rc3
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
1.1.0
1.1.0rc0
1.1.0rc1
1.1.101
1.1.200
1.1.201
1.1.202
1.1.300
1.1.300rc0
1.1.300rc1
1.1.300rc2
1.1.300rc3
1.1.300rc4
1.1.300rc5
1.1.301
1.1.302
1.1.303
1.1.304
1.1.305
1.1.306
1.1.306-fix
1.1.400
1.1.400rc0
1.1.400rc1
1.1.401
1.1.402
1.1.403rc0
1.1.404
1.2.0
1.3.0rc0
2.*
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
2.0.dev0
2.0.dev2
2.0dev1
2.0rc1
2.1.0
2.1.1
2.1.2
2.10.0
2.2.0
2.2.1
2.3.0
2.4.0
2.4.0rc0
2.4.1
2.4.2
2.4.201
2.4.3
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

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56104.json"