Answer in brief
CVE-2026-56104 records a Critical severity (CVSS 8.2) vulnerability in Chainlit contains a session hijacking vulnerability. The current sources do not mark it as known exploited. The current feed maps chainlit (pip), chainlit (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps chainlit (pip), chainlit (pypi). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| chainlitpip | <2.10.1 | 2.10.1 |
| chainlitpypi | >=0 <2.10.1 | 2.10.1 |
Published upstream
Jun 22, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Sep 21, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Jun 22, 2026
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.
Quoted source text, attributed separately from HOL analysis.