CVE-2026-86522 Log injection via an unescaped password reset identity in AshAuthentication
An unauthenticated attacker can forge application log entries by injecting newlines into password reset identities, potentially misleading security monitoring.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-86522?
CVE-2026-86522 is a medium-severity vulnerability in team-alembic ash_authentication, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper Output Neutralization for Logs vulnerability in team-alembic AshAuthentication allows an unauthenticated attacker to forge application log entries by submitting a password reset identity containing newlines or control characters.
AshAuthentication.Strategy.Password.RequestPasswordReset.run/3 interpolates the identity argument, the email or username taken straight from the reset request, into its Logger.warning/1 heredocs without escaping, truncating or type-restricting it. The resource logged beside it is passed through inspect/1, which would have neutralized the value. A newline in the identity therefore ends the log record, and everything after it is written as a line of its own, so an attacker chooses the severity tag and the content of entries that appear to have come from the application.
This issue affects ash_authentication: from 4.2.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.
Weakness: CWE-117
Which versions are affected by CVE-2026-86522?
1 open source package ship an affected version, including ash_authentication.
| Package | Affected | Fixed in |
|---|---|---|
ash_authentication Hex | From 4.2.0 | 4.15.0, 5.0.0-rc.14 |
How do I fix CVE-2026-86522?
Upgrade ash_authentication to a fixed version for your release line: 4.15.0 or 5.0.0-rc.14.
Is CVE-2026-86522 being exploited?
There is no known exploitation of CVE-2026-86522 in the wild and no public exploit code.
Sources
Also known as EEF-CVE-2026-86522, GHSA-wg7g-r393-vr3g.