TI-2023-18610 Aliases CVE-2023-36816

Cross-Site Scripting (XSS) at Account creation in 2FAuth

MEDIUM 60CWE-79Published 2023-07-03 · Updated 2024-11-22

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

2FA is a Web app to manage Two-Factor Authentication (2FA) accounts and generate their security codes. Cross site scripting (XSS) injection can be done via the account/service field. This was tested in docker-compose environment. This vulnerability has been patched in version 4.0.3.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00495 42nd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed 2FAuth (Bubka): 4.0.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Bubka	2FAuth	before 4.0.3	4.0.3	Patch available	CNA

2FAuth VendorBubka Affected before 4.0.3 Fixed in 4.0.3 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:2fauth:2fauth::::::::	before 4.0.3	Vulnerable	Bubka

cpe:2.3:a:2fauth:2fauth:*:*:*:*:*:*:*:* Versions before 4.0.3 Vulnerable ·Bubka

Remediation

Fix · CNA 2FAuth (Bubka) Fixed in 4.0.3

Timeline

2026-10-02 Threatist record created from CVE-2023-36816

References

Exploit 1

https://github.com/Bubka/2FAuth/security/advisories/GHSA-cwhq-2mcq-pp9q

Other 1

https://github.com/Bubka/2FAuth/releases/tag/v4.0.3

TI-2026-24670 2FAuth has Blind SSRF in image parameter allows internal network access and more CVSS 4.0HIGH 7.8
TI-2024-35258 2FAuth vulnerable to Server Side Request Forgery + URI validation bypass in 2fauth /api/v1/twofaccounts/preview CVSS 3.1HIGH 7.5
TI-2025-28827 A group deletion race condition in 2FAuth v5.5.0 causes data inconsistencies and orphaned… CVSS 3.1MEDIUM 6.5
TI-2024-35257 2FAuth vulnerable to stored cross-site scripting via SVG upload and direct access render CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences