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CVE-2026-86112

BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints

CVSS 4.0 5.3 MEDIUMCVSS 3.1 5.4 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-86112

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

Exploitation and risk

Source status

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cve-program · CVE-2026-86112

Published

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.

Source published
5 Sep 2026 09:59:04 UTC
Source modified
24 Sep 2026 14:20:59 UTC
Saved here
23 Oct 2026 15:48:27 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · 5.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1 · 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

ChangeIntel

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Sources read 12 Nov 13:19 UTC · 273 of 275 readable · 271 fully read · documentation 469/469 current

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