LightLLM through 1.2.0 Server-Side Request Forgery via multimodal endpoints

Advisories

LightLLM through 1.2.0 Server-Side Request Forgery via multimodal endpoints

severity: medium
date: 9/30/2026
Affecting: LightLLM <= 1.2.0
CVE: CVE-2026-103243
CWE: CWE-918 Server-Side Request Forgery (SSRF)
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
References: GitHub Issue #1608
https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/utils/multimodal_utils.py#L82-L91
https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/multimodal_params.py#L149
https://github.com/ModelTC/LightLLM
Credit: Mingkai Yu, Jiapeng Li, Jiajia Liu
Description: LightLLM through 1.2.0 fails to validate image_url and audio_url parameters in multimodal endpoints, allowing unauthenticated attackers to perform server-side request forgery. Attackers can supply arbitrary URLs to fetch internal resources, with vision model processing disclosing content or error responses revealing internal network topology.

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