LeadSnap WordPress plugin: PHP Object Injection
Summary
The LeadSnap WordPress plugin up to version 1.25 contains an unauthenticated PHP Object Injection flaw (CWE-502). An attacker who can reach the site over the network can send crafted data that the plugin deserializes, which may enable harmful actions on the server, depending on other plugins or themes installed on the same site. The CNA (Patchstack) rates it CVSS 9.8 (critical). Whether version 1.25 is actually affected is disputed, because the vendor changelog describes 1.25 as a release that removed a vulnerability.
Affected
- LeadSnap WordPress plugin up to and including 1.25 (according to the CVE record)
- Note: the vendor changelog lists 1.25 as a security fix release, which contradicts the CVE range. Unverified.
Fixed in
Unknown. No patched version has been confirmed for CVE-2026-90888. Do not assume 1.25 is safe until this is verified.
Workaround
- No vendor workaround found.
- Deactivate and remove the plugin if the lead connector is not essential.
- Check whether a WAF or virtual patch covers this plugin (none specific to this CVE was found).
Exploitation
- Patchstack rates exploitation as expected and automatable (CISA SSVC: Automatable yes, Technical Impact total).
- OffSeq and Strix list the CVE as not known to be exploited and not in CISA KEV.
- VulDB states no exploit is available and technical details are unknown.
- No public proof of concept found; the record was published recently, so this should be rechecked.
Our recommendation
- Inventory all WordPress sites with LeadSnap installed, including client sites.
- Deactivate and remove LeadSnap where it is not needed.
- Where it is needed, check the vendor changelog and the Patchstack advisory daily until a fixed version is confirmed.
- Review other plugins and themes on the same sites, since object injection impact depends on gadget chains.
- Monitor web server logs for suspicious requests and keep backups available.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Patchstack advisory CVE-2026-90888 patchstack.com
- WordPress.org LeadSnap plugin page and changelog wordpress.org
- Wordfence: LeadSnap up to 1.23 unauthenticated PHP object injection www.wordfence.com
- OffSeq Radar CVE-2026-90888 radar.offseq.com
- Strix CVE-2026-90888 www.strix.ai
- VulDB entry 429302 vuldb.com
- Invicti: LeadSnap PHP object injection 1.23 www.invicti.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, 20:30.
Original description (NVD)
Unauthenticated PHP Object Injection in LeadSnap <= 1.25 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.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.