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Fencer Vulns
critical 9.8

CVE-2025-64103 json

Zitadel Bypass Second Authentication Factor

published 2025-10-29 12 mo ago modified 2026-10-19 20 d ago also EUVD-2025-36696 , GHSA-cfjq-28r2-4jv5 , GO-2025-4083

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

Starting from 2.53.6, 2.54.3, and 2.55.0, Zitadel only required multi factor authentication in case the login policy has either enabled requireMFA or requireMFAForLocalUsers. If a user has set up MFA without this requirement, Zitadel would consider single factor auhtenticated sessions as valid as well and not require multiple factors. Bypassing second authentication factors weakens multifactor authentication and enables attackers to bypass the more secure factor. An attacker can target the TOTP code alone, only six digits, bypassing password verification entirely and potentially compromising accounts with 2FA enabled. This vulnerability is fixed in 4.6.0, 3.4.3, and 2.71.18.

Patch / fix

  • go github.com/zitadel/zitadel/v2 2.71.18
  • go github.com/zitadel/zitadel 1.80.0-v2.20.0.20251029091250-b284f8474eed
  • zitadel zitadel 2.71.18, 3.4.3, 4.6.0
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20251105T184115-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2025:15710-1

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
12 mo ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/zitadel/zitadel/v2
>=2.53.6, <=2.53.9
>=2.54.3, <=2.54.10
>=2.55.0, <2.71.18
2.71.18
go github.com/zitadel/zitadel
<1.80.0-v2.20.0.20251029091250-b284f8474eed
all versions
1.80.0-v2.20.0.20251029091250-b284f8474eed

Affected products

  • zitadel zitadel

Classification

Weakness
  • CWE-308 Use of Single-factor Authentication
  • CWE-287 Improper Authentication

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.