CVE-2025-53940 — Quiet uses insecure, inconsistent verification on local backend token
Quiet is an alternative to team chat apps like Slack, Discord, and Element that does not require trusting a central server or running one's own. In versions 6.1.0-alpha.4 and be…
Published: 2025-07-24 · CVSS: 8.5 · CVSS 4.0
Quiet is an alternative to team chat apps like Slack, Discord, and Element that does not require trusting a central server or running one's own. In versions 6.1.0-alpha.4 and below, Quiet's API for backend/frontend communication was using an insecure, not constant-time comparison function for token verification. This allowed for a potential timing attack where an attacker would try different token values and observe tiny differences in the response time (wrong characters fail faster) to guess the whole token one character at a time. This is fixed in version 6.0.1.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7