---
cve: "CVE-2026-86178"
severity: "MEDIUM"
cvss: 5.4
epss: "4.5%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-09-05 11:16:46"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T22:10:09+02:00"
---

# CVE-2026-86178

> 5.4 MEDIUM

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-86178) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_