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CVE-2026-109373

8.1, high

ZITADEL 3.0.0 before 4.19.2 contains an authentication bypass vulnerability in the Login V2 UI that allows unauthenticated attackers to…

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.1, high high CVSS v3.1
EPSS, next 30 days
0.4% higher than 35.1% of scored CVEs
Exploitation
No public evidence
Published
12 Oct 20265 days ago

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.

Details

Vendor
Zitadel
Product
zitadel
Weakness
CWE-441 (opens in a new tab)
Status
Deferred
Updated
12 Oct 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Zitadel CVEs

Every Zitadel CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-109371 zitadel Missing Authentication for Critical Function Vulnerability EPSS 0.4% 8.2, high
  • CVE-2026-109372 zitadel Improper Authentication Vulnerability EPSS 0.4% 8.7, high

Beyond this page

Is CVE-2026-109373 in your network?

This page tells you how dangerous CVE-2026-109373 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.