Vulnerability DatabaseCVE-2026-86178
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CVE-2026-86178
Published:September 05, 2026
Updated:September 22, 2026
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.
Related Resources (8)
https://github.com/pixelfed/pixelfed
https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L487-L501
https://www.vulncheck.com/advisories/pixelfed-through-0.12.9-unauthorized-story-access-via-api
https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L566-L580
https://github.com/geo-chen/oss/blob/main/Pixelfed.md
https://nvd.nist.gov/vuln/detail/CVE-2026-86178
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86178.json
https://github.com/pixelfed/pixelfed/blob/v0.12.9/routes/web-api.php#L154-L155
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CVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.4
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Missing Authorization
CWE-862
EPSS
Base Score:
0.18