EUVD-2026-83647
GHSA-5jhw-m65c-75cw
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Remote and low-complexity but requires an authenticated user context (PR:L); the read-only instancePeers endpoint discloses a low-sensitivity peer list, so C:L and I/A:N (correcting vendor's VI:L to a confidentiality impact).
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
4DescriptionCVE.org
A vulnerability was identified in Pixelfed up to 0.12.11. Impacted is the function instancePeers of the file app/Http/Controllers/Api/ApiV1Controller.php of the component OAuth Scope Handler. Such manipulation of the argument ID leads to missing authentication. The attack may be performed from remote. The exploit is publicly available and might be used. Upgrading to version 0.12.10 is recommended to address this issue. The name of the patch is 68dca5097305fa0065d029587b2233524636025a. Upgrading the affected component is advised.
AnalysisAI
Missing OAuth token validation in Pixelfed up to 0.12.11 allows an authenticated user without a valid OAuth token to reach the /api/v1 instancePeers endpoint and enumerate federated peer instances, a low-sensitivity information exposure tracked as CWE-306. Publicly available exploit code exists, and the vendor has released a patch (v0.12.10, commit 68dca5097305fa0065d029587b2233524636025a) with a GitHub issue and PR. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires reaching the Pixelfed /api/v1 instancePeers endpoint with an authenticated user context that lacks a valid OAuth access token (PR:L) - the pre-patch code only verified `$request->user()` existed, not that a proper OAuth token was present. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuinely low-priority issue despite the 'Authentication Bypass'/CWE-306 framing. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: 0.12.10 (GitHub PR 6774, commit 68dca5097305fa0065d029587b2233524636025a, release https://github.com/pixelfed/pixelfed/releases/tag/v0.12.10). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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