NewsPublished 24 Apr 2026

In Other News: Unauthorized Mythos Access, Plankey CISA Nomination Ends, New Display Security Device

Source SecurityWeek

Description

Other noteworthy stories that might have slipped under the radar: Supreme Court hacker sentenced, Lovable exposed user data, Google expands enterprise security. The post In Other News: Unauthorized Mythos Access, Plankey CISA Nomination Ends, New Display Security Device appeared first on SecurityWeek .

Impact

Unauthorized access to Anthropic's Claude Mythos could lead to misuse or unintended exposure of advanced AI capabilities. The France Titres breach potentially compromises personal data of millions, increasing risks of identity theft or fraud. Lovable's vulnerability exposed sensitive user data, including source code and credentials, which could undermine user trust and lead to further exploitation. The Supreme Court breach demonstrated credential theft risks but resulted in no financial exploitation. The UK military deployment and NCSC hardware device represent defensive measures rather than direct impacts. Overall, these incidents highlight risks to data confidentiality and system integrity across multiple sectors.

Defensive guidance

Anthropic has restricted access to the abused portal, indicating a temporary mitigation. Lovable reversed its initial stance and acknowledged the vulnerability, implying remediation efforts are underway. Organizations affected by similar vulnerabilities should verify access controls and audit third-party vendor environments. For the France Titres breach, affected users should be notified and advised on protective measures. The UK NCSC's SilentGlass device is available for deployment in high-threat environments to prevent data leakage via display connections. Monitor vendor advisories for updates and apply official patches or fixes as they become available.

Summary

The primary security threat detailed is unauthorized access to Anthropic's Claude Mythos AI system through a third-party vendor environment, which allowed testers to access advanced AI capabilities without authorization. Additionally, a significant data breach at the French state agency France Titres exposed approximately 19 million user records, including personal identifiers. The startup Lovable experienced a broken access control vulnerability (BOLA) that exposed user source code, credentials, and chat history to other free account holders. The report also references other cybersecurity events such as a Supreme Court breach by a hacker using stolen credentials, UK military actions to protect internet infrastructure, and the UK NCSC's development of a hardware device to prevent data leakage via display connections.

References

securityweek.com/in-other-news-unauthorized-mythos-access-plankey-cisa-nomination-ends-new-display-security-device/ (opens in a new tab)

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AI analysisMachine-generated, updated 24 Apr 2026, 14:36 UTC

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