CVE-2026-86178

medium

Description

Pixelfed through 0.12.9 fails to validate follower status in StoryComposeController react and comment endpoints, allowing authenticated users to access follower-only stories. Attackers can enumerate sequential story IDs and submit reactions or comments to retrieve story media URLs and author information without following the account.

References

https://www.vulncheck.com/advisories/pixelfed-through-0.12.9-unauthorized-story-access-via-api

https://github.com/pixelfed/pixelfed/blob/v0.12.9/routes/web-api.php#L154-L155

https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L566-L580

https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L487-L501

https://github.com/pixelfed/pixelfed

https://github.com/geo-chen/oss/blob/main/Pixelfed.md

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-71977

Details

Source: Mitre, NVD

Published: 2026-09-05

Updated: 2026-09-23

Risk Information

CVSS v2

Base Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.4

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

Severity: Medium

CVSS v4

Base Score: 5.3

Vector: 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

Severity: Medium

EPSS

EPSS: 0.0032