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FCEB Sitecore CVE-2025-53690 mitigation advisory

Advisory/Mitigation
First reported
Last updated
Happening score
H score 44
1 unique sources, 1 articles

Summary

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FCEB agencies were told to remediate exposed Sitecore instances by September 25, 2025 after CVE-2025-53690 was found under active exploitation. The guidance calls for rotating ASP.NET machine keys and hardening configurations to cut off remote code execution risk. It also directs defenders to scan for signs of compromise on affected systems.

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Timeline

  1. 05.09.2025 19:08 1 articles · 10mo ago

    CISA warns FCEB agencies to patch exposed Sitecore instances

    Initial Disclosure

    CISA advised Federal Civilian Executive Branch agencies to update exposed Sitecore instances after CVE-2025-53690 was identified as a critical flaw under active exploitation. The affected Sitecore Experience Manager (XM), Experience Platform (XP), Experience Commerce (XC), and Managed Cloud products contain a deserialization of untrusted data vulnerability involving default machine keys that can let attackers achieve remote code execution.

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  2. 05.09.2025 19:08 2 articles · 10mo ago

    FCEB agencies face the Sitecore remediation deadline

    Mitigation Patch Update

    Affected Sitecore deployments reach the September 25, 2025 remediation deadline, when administrators are expected to rotate ASP.NET machine keys, lock down configurations, and scan environments for signs of compromise. The deadline addresses CVE-2025-53690, where exposed machine keys can be abused for ViewState deserialization attacks and remote code execution.

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