CVE-2026-15617 Principal/domain lookup without case normalization
Attackers can bypass authentication and take over accounts by exploiting case or Unicode differences in email and identifier lookups.
- 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-2026-15617?
CVE-2026-15617 is a critical authentication bypass vulnerability in Logto, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Logto performs principal lookup without normalizing email and identifier strings, enabling principal collision and unauthorized account access via case- or Unicode-different identities.
Weakness: CWE-178
Which versions are affected by CVE-2026-15617?
How do I fix CVE-2026-15617?
No fix has been published for CVE-2026-15617 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-2026-15617 being exploited?
There is no known exploitation of CVE-2026-15617 in the wild and no public exploit code.
Sources
Also known as GHSA-257m-4vpx-xg86.