CVE-2026-86178

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.

Score

CVSS 3.1 5.4 Medium

Status

Deferred - disclosure@vulncheck.com

Published

2026-09-05

Last modified

2026-09-24

Weaknesses

CWE-862

Affected products

• Pixelfed (Pixelfed)

References

• https://github.com/geo-chen/oss/blob/main/Pixelfed.md
• https://github.com/pixelfed/pixelfed
• https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L487-L501
• 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/routes/web-api.php#L154-L155
• https://www.vulncheck.com/advisories/pixelfed-through-0.12.9-unauthorized-story-access-via-api