CVE-2024-28855: ZITADEL vulnerable to improper HTML sanitization

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-18 · updated 2026-06-17
Weakness: CWE-20

Description

ZITADEL, open source authentication management software, uses Go templates to render the login UI. Due to a improper use of the `text/template` instead of the `html/template` package, the Login UI did not sanitize input parameters prior to versions 2.47.3, 2.46.1, 2.45.1, 2.44.3, 2.43.9, 2.42.15, and 2.41.15. An attacker could create a malicious link, where he injected code which would be rendered as part of the login screen. While it was possible to inject HTML including JavaScript, the execution of such scripts would be prevented by the Content Security Policy. Versions 2.47.3, 2.46.1, 2.45.1, 2.44.3, 2.43.9, 2.42.15, and 2.41.15 contain a patch for this issue. No known workarounds are available.

Affected products

zitadel: before 2.41.15; from 2.42.0 before 2.42.15; from 2.43.0 before 2.43.9; from 2.44.0 before 2.44.3; from 2.47.0 before 2.47.4; 2.45.0, 2.45.0-rc1, 2.46.0, 2.46.0-rc1, 2.46.0-rc2 — fixed in 2.41.15, 2.42.15, 2.43.9, 2.44.3, 2.47.4

How to fix

Upgrade to a fixed version: zitadel 2.41.15, 2.42.15, 2.43.9, 2.44.3. Check the vendor advisory for mitigations.

References

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