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9.1

DeepSeek V4 allows unauthorized actions through crafted input

CVE-2026-52394 · published 22 days ago
Summary

The DeepSeek V4 software can be tricked by specially formed data into thinking a user has more rights than they actually do. This could let an attacker view, change, or delete information they shouldn't access. Apply any available updates from the vendor and restrict untrusted input wherever possible.

Original advisory text
DeepSeek V4 is vulnerable to Incorrect Access Control via a crafted input.
DeepSeek V4 is vulnerable to Incorrect Access Control via a crafted input.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.1 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-201Insertion of Sensitive Information Into Sent Data
CWE-209Generation of Error Message Containing Sensitive Information
Timeline
Published13 Oct 2026
Updated4 Nov 2026
First seen13 Oct 2026
Sources
CVE-2026-52394 · NVD
CVE-2026-52394 · MITRE
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