Session rebinding via substring-matched cookie names
Published Aug 31, 2026 · Updated Aug 31, 2026
Cookie validation failure in Ash Framework AshAdmin 0.9.1 through 1.3.0 allows remote attackers to rebind an admin session via a sibling subdomain. The client-side getCookie function applies an unanchored regular expression to document.cookie, so a prefixed cookie name can win a suffix match and feed attacker-controlled values into LiveSocket parameters. Exploitation requires control of a sibling subdomain and a parent-domain cookie serialized first; it can change the actor, tenant, or authorization mode used by an administrator's session.
Summary
What happened
Cookie validation failure in Ash Framework AshAdmin 0.9.1 through 1.3.0 allows remote attackers to rebind an admin session via a sibling subdomain. The client-side getCookie function applies an unanchored regular expression to document.cookie, so a prefixed cookie name can win a suffix match and feed attacker-controlled values into LiveSocket parameters. Exploitation requires control of a sibling subdomain and a parent-domain cookie serialized first; it can change the actor, tenant, or authorization mode used by an administrator's session.
The record
- CVE
- CVE-2026-75757
- Published
- Aug 31, 2026
- Updated
- Aug 31, 2026
- Vendor
- Ash Framework
- Product
- AshAdmin
- Classifications
- CWE-565, CAPEC-31
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 31, 2026CVE publishedPublication date reported by the CVE source.
- Aug 31, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.9.1 <1.3.1
- Affected versionversion=77a43cc4fa04cb59c38fc434568a35a38ecb995a <e93a3408a85035e1f90275d02bc2470c96095e56
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- AshAdmin cookie-shadowing proof of conceptfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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