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Argo CD ServerSideDiff Flaw Allows Attackers to Extract Kubernetes Secrets

ATT&CK techniques detected

2 predictions

T1552.007Container API

56%

“the mutation webhook option is enabled. once exploited, an attacker can seamlessly extract authentic kubernetes secret values, which frequently include service account tokens, database credentials, api keys, and tls certificates. a detailed proof - of - concept python script has …”

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T1552.007Container API

41%

“##resource, successfully use a specific function to hide secret data, the vulnerable serversidediff grpc and rest endpoints construct responses using raw, unmasked states. according to the technical breakdown provided by maintainer alexmt, argo cd typically relies on a defense la…”

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Summary

A critical vulnerability has been identified in Argo CD that could allow attackers with minimal privileges to extract highly sensitive Kubernetes Secrets directly from etcd clusters. Tracked as CVE-2026-42880 and rated 9.6, this severe security flaw exposes a missing authorisation and data-masking gap within the platform. According to the disclosure, this exposure primarily affects environments […]

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