{"data":{"id":"38ddb1eb-909b-4d11-ace1-29a95ebef653","title":"Training AIs to Solve CAPTCHAs","summary":"Researchers built a CAPTCHA solver that pairs a fine-tuned YOLOv8 detector with an open-weight vision-language model behind a confidence-based router, operating only from screenshots and OS input events. It reaches 85.4% overall and 84.2% macro accuracy across 16 classes, and the detector learns new categories from the model's answers without human annotation. Adversarial perturbations that drive the detector to 0% accuracy are recovered through the same loop, which the authors argue means visual CAPTCHA defenses understate how quickly an adaptive solver returns.","solution":"N/A -- no mitigation discussed in source.","labels":["security","research"],"sourceUrl":"https://www.schneier.com/blog/archives/2026/10/training-ais-to-solve-captchas.html","publishedAt":"2026-10-19T11:07:43.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":["model_evasion"],"issueType":"news","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":[],"affectedVendorsRaw":["YOLOv8","vision-language models (VLMs)","open-weight VLM"],"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":"2026-10-19T11:07:43.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"advanced","impactType":["integrity","availability"],"aiComponentTargeted":"model","llmSpecific":false,"classifierConfidence":0.85,"researchCategory":null,"atlasIds":null}}