CVE-2025-25202Network attack vector

Authentication bypass via malformed generated revocation action

Published Feb 11, 2025 · Updated Feb 12, 2025

Improper privilege management in Alembic Ash Authentication 4.1.0 through 4.4.8 allows remote attackers to reuse revoked authentication tokens. The installer-generated revoked? action rejects calls when either alternative token identifier is nil and lacks a boolean return declaration, so revocation checks fail to report revoked tokens correctly. Exploitation requires an installer-generated application using magic links, password resets, confirmation, or custom revocation, plus possession of an unexpired token.

CVSS severity6.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper privilege management in Alembic Ash Authentication 4.1.0 through 4.4.8 allows remote attackers to reuse revoked authentication tokens. The installer-generated revoked? action rejects calls when either alternative token identifier is nil and lacks a boolean return declaration, so revocation checks fail to report revoked tokens correctly. Exploitation requires an installer-generated application using magic links, password resets, confirmation, or custom revocation, plus possession of an unexpired token.

The record

CVE
CVE-2025-25202
Published
Feb 11, 2025
Updated
Feb 12, 2025
Vendor
Alembic
Product
Ash Authentication
Classifications
CWE-269, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.1.0, < 4.4.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Alembic · Ash Authenticationversion=>= 4.1.0, < 4.4.9

Published CVSS scores

6.3GitHub, Inc.CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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