Frontier models found the vulnerabilities. Only the attacker found the chains.
Blog post from Snyk
A comparison on Snyk’s deliberately vulnerable TaintedPort application evaluated Evo Continuous Offensive Security (COS), which tested a live URL with optional source access, against Claude Security running Mythos, which analyzed source code only. Using a fixed benchmark of 57 known vulnerabilities and 15 exploit chains, Evo COS reported 50 vulnerabilities, confirmed 10 exploit chains, achieved 75.7% severity-weighted detection, and had a 91.7% F1 score, while Claude Security found 37 vulnerabilities, achieved 49.6% weighted detection, and had a 75.5% F1 score; Claude found one more critical-severity vulnerability. The comparison highlights an SSRF flaw and hardcoded JWT secret that all tools identified individually, while Evo COS reportedly demonstrated their use together to retrieve the secret, forge an administrator token, and access administrative functionality. The authors argue that dynamic testing can validate runtime behavior and multi-step exploitability that source analysis may only infer, whereas static analysis can reveal source-level logic and cryptographic issues that may not surface during live testing. They characterize the approaches as complementary, emphasizing that Evo COS combines multiple models, prior platform context, specialized agents, and independent validation, while noting the results came from one run per tool on an application built and maintained by Snyk.
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