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CVE-2026-86112

BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints

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.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Bookwyrm-social Joinbookwyrm
Products
Bookwyrm Bookwyrm
CVE-2026-86111

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

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.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Bookwyrm-social Joinbookwyrm
Products
Bookwyrm Bookwyrm
CVE-2026-86113

BookWyrm through 0.9.1 Insecure Direct Object Reference in edit-readthrough Allows Tampering with Other Users' Reading Records

BookWyrm through 0.9.1 contains an authorization bypass vulnerability in the edit_readthrough function that allows authenticated users to modify other users' reading records. Attackers can exploit sequential ReadThrough IDs to overwrite arbitrary users' start dates, finish dates, progress, and progress mode, affecting reading statistics and exported data.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Bookwyrm-social Joinbookwyrm
Products
Bookwyrm Bookwyrm
CVE-2022-23644

Server-side request forgery in BookWyrm

BookWyrm is a decentralized social network for tracking reading habits and reviewing books. The functionality to load a cover via url is vulnerable to a server-side request forgery attack. Any BookWyrm instance running a version prior to v0.3.0 is susceptible to attack from a logged-in user. The problem has been patched and administrators should upgrade to version 0.3.0 As a workaround, BookWyrm instances can close registration and limit members to trusted individuals.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Joinbookwyrm
Products
Bookwyrm
CVE-2022-31136

Cross-site Scripting in BookWyrm

Bookwyrm is an open source social reading and reviewing program. Versions of Bookwyrm prior to 0.4.1 did not properly sanitize html being rendered to users. Unprivileged users are able to inject scripts into user profiles, book descriptions, and statuses. These vulnerabilities may be exploited as cross site scripting attacks on users viewing these fields. Users are advised to upgrade to version 0.4.1. There are no known workarounds for this issue.

CVSS 3.1 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Joinbookwyrm
Products
Bookwyrm
CVE-2022-35925

Missing rate limit in Authentication in bookwyrm

BookWyrm is a social network for tracking reading. Versions prior to 0.4.5 were found to lack rate limiting on authentication views which allows brute-force attacks. This issue has been patched in version 0.4.5. Admins with existing instances will need to update their `nginx.conf` file that was created when the instance was set up. Users are advised advised to upgrade. Users unable to upgrade may update their nginx.conf files with the changes manually.

CVSS 3.1 · 5.3 Medium EPSS 1.8% KEV · Not listed
Vendors
Joinbookwyrm
Products
Bookwyrm
CVE-2022-35953

URL Redirection to Untrusted Site ('Open Redirect') in bookwyrm

BookWyrm is a social network for tracking your reading, talking about books, writing reviews, and discovering what to read next. Some links in BookWyrm may be vulnerable to tabnabbing, a form of phishing that gives attackers an opportunity to redirect a user to a malicious site. The issue was patched in version 0.4.5.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Joinbookwyrm
Products
Bookwyrm
CVE-2022-2651

Authentication Bypass by Primary Weakness in bookwyrm-social/bookwyrm

Authentication Bypass by Primary Weakness in GitHub repository bookwyrm-social/bookwyrm prior to 0.4.5.

CVSS 3.1 · 9.8 Critical EPSS 16.2% KEV · Not listed
Vendors
Joinbookwyrm
Products
Bookwyrm