# CVE-2026-118505: team-alembic ash_authentication brute force protection bypass

Source: https://junglewise.ai/threats/cve-2026-118505-improper-restriction-of-excessive-authentication-attempts  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-03. Updated: 2026-11-03  
License: CC BY 4.0 with a link back

CVE-2026-118505 · Severity: info · Published 2026-11-03

ash_authentication is an Elixir authentication library that protects sign-in and password reset operations by limiting failed attempts. A configuration bug allows attackers to bypass these protections on custom actions, sign-in with OTP, and registration-enabled signup flows, enabling unlimited password guessing and one-time password enumeration attacks.

Technologies: [Team-Alembic Ash Authentication](https://junglewise.ai/threats/technologies/team-alembic-ash-authentication). Vendors: [Team-Alembic](https://junglewise.ai/threats/vendors/team-alembic).

## Quick answers

**Is CVE-2026-118505 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-118505 being exploited in the wild.

**How severe is CVE-2026-118505?** Informational severity, published 3 November 2026.

**Which products and versions are affected?** Team-Alembic Ash Authentication 5.0.0-rc.4 to before 5.0.0-rc.16.

**Is there a fix for CVE-2026-118505?** Yes: fixed in 5.0.0-rc.16. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-118505 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-118505?** Check whether you run Team-Alembic Ash Authentication at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 5.0.0-rc.16

## Technical details

The brute_force_strategy preparation is only applied to generated actions, not to custom resource-defined actions. When developers override password, magic link, or OTP sign-in actions, the preparation is skipped; additionally, OTP sign-in with registration enabled is a create action, which do not execute preparations. An unauthenticated attacker can make unlimited authentication attempts without rate limiting.

## Affected products

- team-alembic ash_authentication 5.0.0-rc.4 to before 5.0.0-rc.16

## Timeline

- 2026-11-03: disclosed

## References

- [https://repo.hex.pm/](https://repo.hex.pm/)
- [https://github.com/](https://github.com/)

## Related threats

- [team-alembic ash_authentication session invalidation bypass](https://junglewise.ai/threats/cve-2026-110826-improper-session-invalidation-after-authentication-credential)
- [team-alembic ash_authentication authorization bypass in TOTP](https://junglewise.ai/threats/cve-2026-119215-authorization-bypass-through-user-controlled-key-vulnerability)