Zoho Flow WordPress plugin: Unauthenticated PHP Object Injection
Summary
The Zoho Flow plugin for WordPress up to version 2.14.5 contains a PHP Object Injection vulnerability (CWE-502) that can be triggered without authentication over the network. An attacker who sends crafted serialized data to the affected site may manipulate how the site processes data, which can lead to harmful actions on the server, depending on the PHP classes available on the site. No official patch was confirmed at the time of research, and the fixed version is unknown.
Affected
- Zoho Flow WordPress plugin up to and including 2.14.5 (per the CVE record and Patchstack)
- VulDB lists 2.14.0 through 2.14.5; whether earlier versions are affected is unknown.
Fixed in
Unknown. No fixed version or vendor patch has been confirmed.
Workaround
- Deactivate and remove the plugin on sites where it is not needed.
- If it must stay, restrict access to the plugin's endpoints and monitor web logs.
- Ask your WAF or hosting provider about virtual patching; no vendor-published WAF rule is known.
Exploitation
- Not known to be exploited in the wild; not listed in CISA KEV.
- No public proof-of-concept found.
- Patchstack rates the priority as high and expects exploitation; VulDB rates exploitation as easy (its assessment, not confirmed by a researcher).
Our recommendation
- Inventory all WordPress sites and check for Zoho Flow version 2.14.5 or earlier.
- Deactivate and remove the plugin where it is not in use.
- Where it is in use, restrict exposure and add WAF or hosting-level protection.
- Monitor the Patchstack advisory and the WordPress.org changelog for a fixed version, then update and verify.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Patchstack advisory CVE-2026-62131 patchstack.com
- VulDB entry 428558 vuldb.com
- WordPress.org plugin page Zoho Flow wordpress.org
- WPScan Zoho Flow plugin vulnerabilities wpscan.com
- CVE record mirror (threatint) cve.threatint.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 30 Oct 2026, 15:53.
Original description (NVD)
Unauthenticated PHP Object Injection in Zoho Flow <= 2.14.5 versions.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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