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CVE-2026-86178— Pixelfed through 0.12.9 Unauthorized Story Access via API

Quick assessment

Affected
pixelfed pixelfed
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Pixelfed 在 0.12.9 及更早版本中，其 StoryComposeController 的 react（点赞/表情回应）和 comment（评论）端点未正确校验用户的“粉丝”身份，导致已认证用户能够访问仅限粉丝可见的帖子。攻击者可以通过枚举连续的帖子 ID，并提交点赞或评论请求，从而在不关注该账号的情况下，获取帖子的媒体文件 URL 以及作者信息。

CVSS 5.4 · Medium

Possible ATT&CK Techniques 1 AI

T1035

Affected Version Matrix 1

VendorProduct Version RangeStatus
pixelfed pixelfed ≤ 0.12.9 affected
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I. Basic Information for CVE-2026-86178

Vulnerability Information
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Vulnerability Title
Pixelfed through 0.12.9 Unauthorized Story Access via API
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pixelfed pixelfed 0 ~ 0.12.9 -

II. Public POCs for CVE-2026-86178

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-86178

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Patches & Fixes for CVE-2026-86178 (1)

Vendor Pages for CVE-2026-86178 (1)

Other References for CVE-2026-86178 (3)

IV. Related Vulnerabilities

Same product: pixelfed
Same vendor: pixelfed
Same weakness: CWE-862

V. Comments for CVE-2026-86178

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