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CVE-2026-56104

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:05b0b7e5db2d0cf25aef57492ac833c06b46c7af33506efee0f9b63a55b2a084
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.8,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4973b9ab707d91723d5420b6debccc29553304e6aa8cde3e55634b47b9dbab3f · sha256:90d71e36d2b9862a… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4973b9ab707d91723d5420b6debccc29553304e6aa8cde3e55634b47b9dbab3f · sha256:90d71e36d2b9862a… · /containers/cna/metrics/1/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"affected","packageURL":"pkg:github/Chainlit/chainlit","product":"chainlit","repo":"https://github.com/Chainlit/chainlit","vendor":"Chainlit","versions":[{"lessThan":"2.10.1","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4973b9ab707d91723d5420b6debccc29553304e6aa8cde3e55634b47b9dbab3f · sha256:90d71e36d2b9862a… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.8,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4973b9ab707d91723d5420b6debccc29553304e6aa8cde3e55634b47b9dbab3f · sha256:90d71e36d2b9862a… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4973b9ab707d91723d5420b6debccc29553304e6aa8cde3e55634b47b9dbab3f · sha256:90d71e36d2b9862a… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-862","description":"Missing Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4973b9ab707d91723d5420b6debccc29553304e6aa8cde3e55634b47b9dbab3f · sha256:90d71e36d2b9862a… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/Chainlit/chainlit/commit/5effb664f1e0af4a4f0a42fe63ea979676039a7f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4973b9ab707d91723d5420b6debccc29553304e6aa8cde3e55634b47b9dbab3f · sha256:90d71e36d2b9862a… · /containers/cna/references/2
{"name":"Pull Request","tags":["issue-tracking"],"url":"https://github.com/Chainlit/chainlit/pull/2857"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4973b9ab707d91723d5420b6debccc29553304e6aa8cde3e55634b47b9dbab3f · sha256:90d71e36d2b9862a… · /containers/cna/references/1
{"name":"Release Notes","tags":["release-notes"],"url":"https://github.com/Chainlit/chainlit/releases/tag/2.10.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4973b9ab707d91723d5420b6debccc29553304e6aa8cde3e55634b47b9dbab3f · sha256:90d71e36d2b9862a… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/chainlit-session-hijacking-via-websocket-session-restoration"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4973b9ab707d91723d5420b6debccc29553304e6aa8cde3e55634b47b9dbab3f · sha256:90d71e36d2b9862a… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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