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CVE-2026-86112— BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints

Quick assessment

Affected
bookwyrm-social bookwyrm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BookWyrm 0.9.1 及之前版本在“收藏”和“取消收藏”视图中未能正确校验用户的可见性权限，使得经过身份验证的攻击者能够收藏或取消收藏其无权访问的“仅限关注者”或“直接消息”状态。攻击者可以通过向收藏端点 POST 状态 ID 来创建未授权的交互，触发 ActivityPub 广播，并通过响应的差异枚举私有状态 ID。

CVSS 5.4 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
bookwyrm-social bookwyrm ≤ 0.9.1 affected
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I. Basic Information for CVE-2026-86112

Vulnerability Information
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Vulnerability Title
BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
BookWyrm through 0.9.1 fails to validate user visibility permissions in the Favorite and Unfavorite views, allowing authenticated attackers to favorite or unfavorite followers-only and direct statuses they cannot access. Attackers can POST to the favorite endpoint with a status ID to create unauthorized interactions, trigger ActivityPub broadcasts, and enumerate private status IDs through response differentiation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
bookwyrm-social bookwyrm 0 ~ 0.9.1 -

II. Public POCs for CVE-2026-86112

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III. Intelligence Information for CVE-2026-86112

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Patches & Fixes for CVE-2026-86112 (1)

Vendor Advisories for CVE-2026-86112 (1)

Proof of Concept for CVE-2026-86112 (1)

Vendor Pages for CVE-2026-86112 (1)

Same Patch Batch · bookwyrm-social · 2026-09-05 · 3 CVEs total

CVE-2026-86113 6.5 MEDIUM BookWyrm through 0.9.1 Insecure Direct Object Reference in edit-readthrough Allows Tamperi
CVE-2026-86111 6.5 MEDIUM BookWyrm through 0.9.1 Insecure Direct Object Reference in EditStatus Exposes Followers-On

IV. Related Vulnerabilities

Same product: bookwyrm
Same vendor: bookwyrm-social
Same weakness: CWE-639

V. Comments for CVE-2026-86112

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