CVE-2026-86178CWE-862broken-access-control

CVE-2026-86178

Medium · published September 5, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
23.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
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
EPSS
0.00320 · 23.8th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-09-05T15:16Z
References (6)
https://github.com/geo-chen/oss/blob/main/Pixelfed.md · [email protected]https://github.com/pixelfed/pixelfed · [email protected]https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L487-L501 · [email protected]https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L566-L580 · [email protected]https://github.com/pixelfed/pixelfed/blob/v0.12.9/routes/web-api.php#L154-L155 · [email protected]https://www.vulncheck.com/advisories/pixelfed-through-0.12.9-unauthorized-story-access-via-api · [email protected]
EPSS history
Timeline
  • 07 SEP 03:36Z
    EPSS moved — → 0%
    epss
  • 05 SEP 11:01Z
    Pixelfed through 0.12.9 Unauthorized Story Access via API
    cvelistv5