Secuno
ENNL
Book demo

CVE-2026-109373

Authentication bypass

8.1 HIGH
  1. Published12 Oct 2026

Description

ZITADEL 3.0.0 before 4.19.2 contains an authentication bypass vulnerability in the Login V2 UI that allows unauthenticated attackers to obtain other users' session tokens by forging unsigned session cookies. Attackers can guess time-ordered session IDs around a victim's sign-in and supply them with empty tokens to receive rotated tokens, taking over accounts including MFA-completed administrator sessions.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1082619.3
Tina is a headless content management system. Prior to tinacms 3.14.0 and @tinacms/app…
CVE-2026-10225510.0
A Pre-authentication SSRF vulnerability exists in the SMA1000 Appliance Work Place…
CVE-2026-942059.8
Gitea Actions decided whether a fork pull request run needed approval based on the user…
CVE-2026-1063018.1
Confused deputy in Contextual Tasks in Google Chrome prior to 155.0.8059.39 allowed a…
CVE-2026-1062288.3
Confused deputy in Google Lens in Google Chrome prior to 155.0.8059.39 allowed a remote…
CVE-2026-1062218.3
Confused deputy in WebAPKs in Google Chrome on on Android prior to 155.0.8059.39…

Frequently asked

Is CVE-2026-109373 being actively exploited?

CVE-2026-109373 is not in the CISA KEV catalog.

How severe is CVE-2026-109373?

CVE-2026-109373 has a CVSS 3.1 base score of 8.1, rated high.

How do I fix CVE-2026-109373?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-109373 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.