CVE-2026-86178

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.

Affected Platforms

Weakness Type

CWE-862

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/StoryComp…
• https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComp…
• 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-…