Is CVE-2026-74878 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-74878?

CVE-2026-74878 has a CVSS v3 severity of CRITICAL (9.8).

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CVE-2026-74878

Description

openssl_encrypt versions before 1.4.0 use an in-memory rate limiter for TOTP brute-force protection that is not shared across workers and is lost on server restart. Attackers can distribute authentication attempts across multiple server instances or retry immediately after a restart to bypass rate limiting protections.