CVE-2026-21409 Information disclosure in RICOH Streamline NX
A man-in-the-middle attack allows retrieval of user registration information and OIDC tokens from RICOH Streamline NX.
- 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-2026-21409?
CVE-2026-21409 is a high-severity vulnerability in RICOH Streamline NX, published on 9 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper authorization vulnerability exists in RICOH Streamline NX 3.5.1 to 24R3. If a man-in-the-middle attack is conducted on the communication between the affected product and its user, and some crafted request is processed by the product, the user's registration information and/or OIDC (OpenID Connect) tokens may be retrieved.
Weakness: CWE-639
Which versions are affected by CVE-2026-21409?
How do I fix CVE-2026-21409?
No fix has been published for CVE-2026-21409 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-21409 being exploited?
There is no known exploitation of CVE-2026-21409 in the wild and no public exploit code.
Sources
Also known as GHSA-842v-gv8w-xp7c.