Cross-resource impersonation via discarded JWT subject path
Published Sep 17, 2026 · Updated Sep 17, 2026
Improper authentication in Alembic Ash Authentication allows remote authenticated users to impersonate users across resources. The password, WebAuthn, and persistent-session token preparations parse the JWT sub claim but retain only the query string, discarding the resource path that binds the token to the intended subject. Exploitation requires a valid sign-in token for one configured resource and another resource with matching primary-key field names, enabling cross-resource account access without token forgery.
Summary
What happened
Improper authentication in Alembic Ash Authentication allows remote authenticated users to impersonate users across resources. The password, WebAuthn, and persistent-session token preparations parse the JWT sub claim but retain only the query string, discarding the resource path that binds the token to the intended subject. Exploitation requires a valid sign-in token for one configured resource and another resource with matching primary-key field names, enabling cross-resource account access without token forgery.
The record
- CVE
- CVE-2026-80218
- Published
- Sep 17, 2026
- Updated
- Sep 17, 2026
- Vendor
- Alembic
- Product
- Ash Authentication
- Classifications
- CWE-287, T1550.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 17, 2026CVE publishedPublication date reported by the CVE source.
- Sep 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=3.10.5 <4.15.0
- Affected versionversion=5.0.0-rc.0 <5.0.0-rc.14
- Affected versionversion=eca8cadea0f1595ed2c10a0c177b1da9aa9e5269 <* changes=[{"at":"2640e1872e1fef4e4606e601bf00102cff784c03","status":"unaffected"},{"at":"7baac243ca651eee127a84d672eee3fcff42e598","status":"unaffected"}]
What conditions does exploitation require?
What is affected?
Published CVSS scores
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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.
Activity data is delayed. The latest report is Sep 28, 2026.
Public exploit references
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Technologies
Your stack
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