BookWyrm through 0.9.1 Insecure Direct Object Reference in EditStatus Exposes Followers-Only and Direct Statuses

Advisories

BookWyrm through 0.9.1 Insecure Direct Object Reference in EditStatus Exposes Followers-Only and Direct Statuses

severity: high
date: 9/5/2026
Affecting: bookwyrm <= 0.9.1
CVE: CVE-2026-86111
CWE: CWE-639 Authorization Bypass Through User-Controlled Key
CVSS: 7.1
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References: Researcher write-up: finding 1
EditStatus.get: no visibility check
compose template renders draft.raw_content
https://github.com/bookwyrm-social/bookwyrm
Credit: George Chen
Description: BookWyrm through 0.9.1 fails to validate user visibility permissions in the status edit endpoint, allowing authenticated attackers to read followers-only and direct-message reviews by enumerating sequential status IDs. Attackers can access the raw content of restricted statuses through the edit view, bypassing the privacy protections documented for these message types.

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