{"data":{"id":"97e025c0-012d-4b32-b703-3b4be047ea04","title":"PromptGuard: Soft Prompt-Guided Unsafe Content Moderation for Text-to-Image Models","summary":"PromptGuard is a content moderation technique for text-to-image models that optimizes a universal safety soft prompt in the model's textual embedding space to act as an implicit system prompt. A divide-and-conquer strategy builds category-specific soft prompts into holistic safety guidance. Across five datasets it reduces NSFW generation, reaches an average unsafe ratio of 5.84% and 6.18% under multi-head classifiers and VLM-based guardrails, and runs 3.8 times faster than prior methods.","solution":"N/A -- no mitigation discussed in source.","labels":["security","safety","research"],"sourceUrl":"http://ieeexplore.ieee.org/document/11457697","publishedAt":"2026-03-30T13:17:27.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":["other"],"issueType":"research","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":[],"affectedVendorsRaw":["text-to-image models","Stable Diffusion"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"epssCheckedAt":null,"kevDateAdded":null,"advisoryAliases":null,"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":null,"disclosureDate":"2026-03-30T13:17:27.000Z","fixReleasedAt":null,"daysToFix":null,"fixCheckedAt":null,"capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["safety"],"aiComponentTargeted":"model","llmSpecific":false,"classifierConfidence":0.9,"researchCategory":"peer_reviewed","atlasIds":null}}