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Reading a model's own responses was enough to find semantically vulnerable image regions and transfer adversarial examples to unseen commercial models at up to 97 percent attack success

AspireAI community · arXiv
Transferable black-box attacks on multimodal models typically allocate perturbations using surrogate-model saliency, which need not reflect how an unseen model semantically interprets or relies on different image regions. VISTA identifies semantically vulnerable regions purely from an MLLM's responses, with no access to gradients, logits, parameters or internal representations, by building an Uncertainty-Based Multimodal Behavior map from response drift, conflict, misleading answers and semantic shifts, then routing perturbations with entropy-adaptive Sinkhorn routing and a surrogate ensemble. The authors report up to 97 percent attack success rate across GPT-5, Gemini-3.5-Flash and Claude Sonnet 4.6 while keeping peak signal-to-noise ratio above 30 dB, and the pure-transfer variant reaches up to 93 percent attack success without ever querying the final victim, which is the result that makes the threat model cheap. The honest limitation is that this measures a white-box-of-the-response setting against models that were, in practice, adversarially fine-tuned or otherwise reachable, and the paper does not report whether a hardened defense closes the gap.
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