Administrative cookie forgery via recoverable shared secret
Published Apr 16, 2026 · Updated Apr 16, 2026
Privilege escalation in Microchip IStaX before 2026.03 allows remote authenticated users to forge administrative session cookies. The webstax_auth design lets a user recover the shared per-device cookie secret from that user's own low-privilege session cookie and reuse it to sign an administrative cookie. A valid low-privilege account and network access to the management interface are required; forged cookies grant administrative control over the switch.
Summary
What happened
Privilege escalation in Microchip IStaX before 2026.03 allows remote authenticated users to forge administrative session cookies. The webstax_auth design lets a user recover the shared per-device cookie secret from that user's own low-privilege session cookie and reuse it to sign an administrative cookie. A valid low-privilege account and network access to the management interface are required; forged cookies grant administrative control over the switch.
The record
- CVE
- CVE-2026-2336
- Published
- Apr 16, 2026
- Updated
- Apr 16, 2026
- Vendor
- Microchip Technology
- Product
- IStaX
- Classifications
- CWE-331, T1550.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 16, 2026CVE publishedPublication date reported by the CVE source.
- Apr 16, 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 <2026.03
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
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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