Remote code execution via unrestricted Redis deserialization
Published Jan 21, 2026 · Updated Jan 21, 2026
Insecure deserialization in Laravel Reverb before 1.7.0 allows remote attackers to execute code through Redis Pub/Sub messages. PusherPubSubIncomingMessageHandler passes event application and payload values to PHP unserialize() without an allowed-class restriction, permitting attacker-controlled object instantiation. Exploitation requires horizontal scaling to be enabled and attacker access to the configured Redis service; successful code execution runs in the Reverb process context.
Summary
What happened
Insecure deserialization in Laravel Reverb before 1.7.0 allows remote attackers to execute code through Redis Pub/Sub messages. PusherPubSubIncomingMessageHandler passes event application and payload values to PHP unserialize() without an allowed-class restriction, permitting attacker-controlled object instantiation. Exploitation requires horizontal scaling to be enabled and attacker access to the configured Redis service; successful code execution runs in the Reverb process context.
The record
- CVE
- CVE-2026-23524
- Published
- Jan 21, 2026
- Updated
- Jan 21, 2026
- Vendor
- Laravel
- Product
- Laravel Reverb
- Classifications
- CWE-502, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 21, 2026CVE publishedPublication date reported by the CVE source.
- Jan 21, 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=< 1.7.0
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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