Unauthenticated code execution via stored object injection
Published Jul 14, 2026 · Updated Jul 14, 2026
PHP object injection in Tribulant Software Newsletters before 4.15 allows remote attackers to execute code through a public form. The public subscribe form stores a crafted serialized custom text-field value verbatim, and newsletter personalization later deserializes it, instantiating the bundled FileCookieJar gadget to write a chosen file. Exploitation requires a subscribable list with that custom field and a sent campaign using its personalization token; no authentication or nonce is required, and a PHP file written under the web root executes as the web server user.
Summary
What happened
PHP object injection in Tribulant Software Newsletters before 4.15 allows remote attackers to execute code through a public form. The public subscribe form stores a crafted serialized custom text-field value verbatim, and newsletter personalization later deserializes it, instantiating the bundled FileCookieJar gadget to write a chosen file. Exploitation requires a subscribable list with that custom field and a sent campaign using its personalization token; no authentication or nonce is required, and a PHP file written under the web root executes as the web server user.
The record
- CVE
- CVE-2026-12583
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Tribulant Software
- Product
- Newsletters
- Classifications
- CWE-502, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <4.15
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
- WPScan subscriber custom-field object-injection proof of conceptfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo