# CVE-2026-62856: FreeScout: Cross-User Notification Data Disclosure via LIKE Wildcard Injection in Polycast Channel Query

Status: published. Published: 2026-11-06. Updated: 2026-11-06.

FreeScout is a self-hosted help desk and shared mailbox application. Prior to version 1.8.226, the  polycast/receive  endpoint fails to escape SQL LIKE wildcards in supplied channel names, while channel authorization applies only to names with specific prefixes. An unauthenticated attacker with a guest session and valid CSRF token can submit a wildcard channel name to retrieve matching notification events intended for other users. Notification payload generation lacks a corresponding access check, exposing conversation message content, identifiers, URLs, and notification HTML across users and mailboxes. This issue is fixed in version 1.8.226.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- freescout-help-desk / freescout: < 1.8.226 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 7.7 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N; source: CNA: GitHub_M

- CVSS 3.1: 7.7 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-89, CWE-200, CWE-639

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-gh3r-jh6q-wrvj (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/freescout-help-desk/freescout/commit/1f4deee6369d89a70d291248499883b5bfdb99ff (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/freescout-help-desk/freescout/commit/656cb2349cd3bb11f04f01c1587900dfb423a855 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/freescout-help-desk/freescout/releases/tag/1.8.226 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/freescout-help-desk/freescout/commit/1f4deee6369d89a70d291248499883b5bfdb99ff (security-advisories@github.com)

- https://github.com/freescout-help-desk/freescout/commit/656cb2349cd3bb11f04f01c1587900dfb423a855 (security-advisories@github.com)

- https://github.com/freescout-help-desk/freescout/releases/tag/1.8.226 (security-advisories@github.com)

- https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-gh3r-jh6q-wrvj (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-62856; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-62856; retrieved 2026-11-06; source updated 2026-11-06

Revision: e35148120372a018bdf0e777ff50844c727b636c8bfff9a126b930f3e7df493c

Canonical: https://y2.dev/cve/CVE-2026-62856

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