CVE-2026-125748

Description

Parabol before 15.21.2 contains a missing authorization vulnerability in the addReactjiToReactable GraphQL mutation that allows authenticated users to tamper with reactions on other organizations' content. Attackers can pair their own meetingId with a reactableId of another tenant's reflection, comment, or sequential team prompt response to add or remove their reactions.

References

• https://github.com/ParabolInc/parabol/blob/v15.21.1/packages/server/graphql/public/mutations/addReactjiToReactable.ts#L36-L99
• https://github.com/ParabolInc/parabol/commit/1f063b2f2768ad3a6138156ddce9d938f58e8005
• https://github.com/ParabolInc/parabol/issues/13727
• https://github.com/ParabolInc/parabol/releases/tag/v15.21.2
• https://hackmd.io/@hieuPenguinnn/parabol-addreactjitoreactable-cross-meeting-idor