Is CVE-2026-28788 actively exploited?

No active exploitation of CVE-2026-28788 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-28788 be exploited remotely?

Yes. CVE-2026-28788 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-28788?

CVE-2026-28788 has a CVSS score of 7.1 (HIGH).

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HIGH

CVE-2026-28788

CWE-639Published: March 27, 2026· Updated: Apr 1, 2026

7.1

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:10.4th

Official Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, any authenticated user can overwrite any file's content by ID through the `POST /api/v1/retrieval/process/files/batch` endpoint. The endpoint performs no ownership check, so a regular user with read access to a shared knowledge base can obtain file UUIDs via `GET /api/v1/knowledge/{id}/files` and then overwrite those files, escalating from read to write. The overwritten content is served to the LLM via RAG, meaning the attacker controls what the model tells other users. Version 0.8.6 patches the issue.

NVD Source

Technical Analysis

CVE-2026-28788 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.1.