CVE-2026-3106
Blind XSS in Teampass Login Allows Admin Browser Exploitation
Publication date: 2026-03-31
Last updated on: 2026-04-07
Assigner: Spanish National Cybersecurity Institute, S.A. (INCIBE)
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| teampass | teampass | From 3.1.5.16 (inc) to 3.1.5.24 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The provided information does not specify how the Blind Cross-Site Scripting (XSS) vulnerability in Teampass affects compliance with common standards and regulations such as GDPR or HIPAA.
Can you explain this vulnerability to me?
CVE-2026-3106 is a critical Blind Cross-Site Scripting (XSS) vulnerability in Teampass versions prior to 3.1.5.16. It occurs in the password manager's login functionality, specifically in the 'contraseña' parameter of the login form. During failed authentication attempts, the application does not properly sanitize or encode the username field input. This allows arbitrary JavaScript code to be executed automatically in the administrator's browser when viewing failed login entries, resulting in a blind XSS condition.
How can this vulnerability impact me? :
This vulnerability can lead to arbitrary JavaScript code execution in the administrator's browser without their knowledge. An attacker can exploit this to perform actions such as stealing session tokens, manipulating the administrator's interface, or executing malicious actions with the administrator's privileges. This can compromise the security of the password manager and potentially expose sensitive credentials or administrative controls.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability occurs in the 'contraseña' parameter of the login form during failed authentication attempts, where arbitrary JavaScript code can be executed in the administrator's browser when viewing failed login entries.
To detect this vulnerability on your system, you can monitor failed login attempts and inspect the username field input for unsanitized or encoded JavaScript payloads.
Since the vulnerability is triggered when viewing failed login entries, checking logs or database entries for suspicious script tags or JavaScript code in the username field can help identify exploitation attempts.
Specific commands are not provided in the available resources.
What immediate steps should I take to mitigate this vulnerability?
The vulnerability has been fixed in Teampass version 3.1.5.24.
Immediate mitigation steps include upgrading Teampass to version 3.1.5.24 or later to apply the security fix.
Until the upgrade can be performed, restrict access to the login page and the failed login entries view to trusted administrators only to reduce the risk of exploitation.
Additionally, monitor login attempts for suspicious input and consider implementing web application firewall (WAF) rules to block malicious payloads targeting the 'contraseña' parameter.