CVE-2026-62646 Auth bypass in Reyrolle 7SR5
Unauthenticated attackers can predict low-entropy session tokens to bypass authentication on Siemens Reyrolle 7SR5 devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-62646?
CVE-2026-62646 is a critical authentication bypass vulnerability in Siemens Reyrolle 7SR5, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been identified in Reyrolle 7SR5 (All versions < V2.70). A session identifier is generated using an algorithm with insufficient randomness, resulting in a token with low entropy that can be predicted or brute-forced within a feasible number of attempts. This could allow an unauthenticated remote attacker to derive valid session identifiers and bypass authentication.
Weakness: CWE-331
Which versions are affected by CVE-2026-62646?
How do I fix CVE-2026-62646?
No fix has been published for CVE-2026-62646 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-62646 being exploited?
There is no known exploitation of CVE-2026-62646 in the wild and no public exploit code.
Sources
Also known as GHSA-5w7q-mmr4-39pj.