Read the docs
TI-2026-57077 Aliases CVE-2026-82759

Reversible IP address pseudonymisation in AshAuthentication audit log hash mode

Priority LOW 9CWE-760Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Use of a One-Way Hash with a Predictable Salt vulnerability in team-alembic AshAuthentication allows readers of the audit store to recover the client IP addresses that the audit log add-on's :hash privacy mode is meant to pseudonymise. AshAuthentication.AddOn.AuditLog.IpPrivacy.hash_ip/1 computes a single unkeyed :crypto.hash(:sha256, salt <> ip) and truncates the result to 16 hexadecimal characters. The salt is read from the :audit_log_ip_salt or :secret application config keys, and falls back to the constant "default-salt-change-in-production" published in the library source when neither is set, with nothing warning that the default is in use. The IPv4 space is only 2^32 values and SHA-256 is fast, so the whole hash table is precomputable and every stored value maps back to its source address. Truncating to 16 characters does not help, and even a configured salt leaves the hash cheap enough to enumerate once it leaks. This issue affects ash_authentication: from 4.12.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00139 3rd percentileScored 2026-11-07
Fix Fixed ash_authentication (team-alembic): 4.15.0, 5.0.0-rc.14

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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

VendorProductAffected versionsFixed inStatusSource
team-alembicash_authentication4.12.0 to before 4.15.0; 5.0.0-rc.0 to before 5.0.0-rc.144.15.0, 5.0.0-rc.14Patch availableCNA
  • ash_authentication Vendorteam-alembic Affected 4.12.0 to before 4.15.0; 5.0.0-rc.0 to before 5.0.0-rc.14 Fixed in 4.15.0, 5.0.0-rc.14 Patch available CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*———
  • cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:* Versions — — ·—

Remediation

  • Fix · CNA ash_authentication (team-alembic) Fixed in 4.15.0, 5.0.0-rc.14

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    team-alembic ash_authentication 4.15.0, 5.0.0-rc.14

    14 records Highest priority Priority MEDIUM 5 MEDIUM, 9 LOW

    Other records, highest priority first

    • TI-2026-59214 Revoked session accepted because the session jti is never checked in AshAuthentication and AshAuthentication PhoenixPriority MEDIUM 49
    • TI-2026-58664 `require_confirmed_with` is not enforced on the action and fails open on an unreadable attribute in AshAuthenticationPriority MEDIUM 49
    • TI-2026-53751 Remember-me sign-in guard reads a session key that is never written in ash_authentication, allowing session replacementPriority MEDIUM 49
    Show all 14 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-82759

References

Patch 2

Advisory 1

Other 3

  • TI-2026-36668 OAuth2/OIDC account takeover in AshAuthentication via email-based user matching CVSS 4.0CRITICAL 9.2
  • TI-2026-46782 Purpose-limited JWT accepted as full bearer authentication in AshAuthentication CVSS 4.0HIGH 7.6
  • TI-2026-59214 Revoked session accepted because the session jti is never checked in AshAuthentication and AshAuthentication Phoenix CVSS 4.0CRITICAL 9.1
  • TI-2026-58664 `require_confirmed_with` is not enforced on the action and fails open on an unreadable attribute in AshAuthentication CVSS 4.0CRITICAL 9.1
  • TI-2026-53751 Remember-me sign-in guard reads a session key that is never written in ash_authentication, allowing session replacement CVSS 4.0CRITICAL 9.1
  • TI-2026-57079 Magic link single-use tokens replayable via TOCTOU race in AshAuthentication CVSS 4.0CRITICAL 9.1
See all 23 →

Sources

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