Lost in Modality: Evaluating the Effectiveness of Text-Based Membership Inference Attacks on Large Multimodal Models

Large Multimodal Language Models (MLLMs) are emerging as one of the foundational tools in an expanding range of applications.Consequently, understanding training-data leakage in these systems is increasingly critical.Log-probability-based membership inference attacks (MIAs) have become a widely adopted approach for assessing data exposure in large language models (LLMs), yet their effect in MLLMs remains unclear.We present the first comprehensive evaluation of extending these text-based MIA methods to multimodal settings.Our experiments under vision-and-text (V+T) and text-only (T-only) conditions across the DeepSeek-VL and InternVL model families show that in in-distribution settings, logit-based MIAs perform comparably across configurations, with a slight V+T advantage.Conversely, in out-of-distribution settings, visual inputs act as regularizers, effectively masking membership signals.