Impacts Reyrolle protection relays used in power/utility networks; auth bypass could enable control or disruption of electrical protection systems.
CVE-2026-62646
Predictable session tokens in Reyrolle 7SR5 enable unauthenticated authentication bypass
Is CVE-2026-62646 being exploited?
Not confirmed. CVE-2026-62646 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.32% probability of exploitation in the next 30 days.
How severe is CVE-2026-62646?
CVE-2026-62646 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-62646?
Yes. A fix has been recorded for CVE-2026-62646. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-62646 affect?
CVE-2026-62646 affects Reyrolle 7SR5 (< V2.70), Siemens Reyrolle protection relays. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-62646?
Upgrade to V2.70 immediately; isolate relays and restrict management network
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can predict session IDs to bypass authentication and gain access/control of protection relay functions.
Immediate action required
- affected< V2.70
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.