Vulnerability in blackholll loonflow

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

loonflow before r3.2.3 contains a missing authorization vulnerability in TicketFlowHistoryView that allows any authenticated user to read other users' ticket flow history by supplying a ticket UUID. Attackers can request the ticket_flow_history endpoint, which skips ticket_view_permission_check, to obtain approval comments and processor names, emails and phone numbers.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/blackholll/loonflow/blob/r3.2.2/backend/apps/ticket/views.py
• github.com/blackholll/loonflow/commit/a6495b0c2ca9e5dede8e49217a0468bcfa946de4
• github.com/blackholll/loonflow/issues/591
• hackmd.io/@hieuPenguinnn/loonflow-ticket-flow-history-idor
• www.vulncheck.com/advisories/loonflow-before-r3-2.3-idor-via-ticket-flow-history-endpoint
• hackmd.io/@hieuPenguinnn/cve-2026-121937-loonflow-ticket-flow-history-idor