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Vulnerabilities

Vulnerability · CVE-2026-40497

FreeScout is a free self-hosted help desk and shared mailbox.

Published Apr 21, 2026 · catalog updated Jun 17, 2026 · FreeScout is a free

Check if you run it

No confirmed exploitation is on record for CVE-2026-40497. EPSS is 0.43%. Act only if a listed version of FreeScout is a free is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (FreeScout is a free).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.43%
Remediation
Advisory link
Affected products
cpe freescout/freescout

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, FreeScout's removes , , , but does NOT strip tags. The mailbox signature field is saved via POST /mailbox/settings/{id} and later rendered unescaped via in conversation views. CSP allows , so injected inline styles execute freely. An attacker with access to mailbox settings (admin or agent with mailbox permission) can inject CSS attribute selectors to exfiltrate the CSRF token of any agent/admin who views a conversation in that mailbox. With the CSRF token, the attacker can perform any state-changing action as the victim (create admin accounts, change email/password, etc.) — privilege escalation from agent to admin. This is the result of an incomplete fix of GHSA-jqjf-f566-485j. That advisory reported XSS via mailbox signature. The fix applied to the signature before saving. However, only removes , , , and tags — it does NOT strip tags, leaving CSS injection possible. Version 1.8.213 contains an updated fix.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe freescout/freescoutversion unspecified

How to fix CVE-2026-40497

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40497. EPSS is 0.43%. Act only if a listed version of FreeScout is a free is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.43%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 21, 2026 · NIST NVD

    Detected

    FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, FreeScout's removes , , , but does NOT strip tags. The mailbox signature field is saved via POST /mailbox/settings/{id} and later rendered unescaped via in conversation views. CSP allows , so injected inline styles execute freely. An attacker with access to mailbox settings (admin or agent with mailbox permissi

  2. Jun 17, 2026 · NIST NVD

    Updated

    FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, FreeScout's removes , , , but does NOT strip tags. The mailbox signature field is saved via POST /mailbox/settings/{id} and later rendered unescaped via in conversation views. CSP allows , so injected inline styles execute freely. An attacker with access to mailbox settings (admin or agent with mailbox permissi

Sources

  • CVE.orgVulnerability recordCVE-2026-40497

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40497

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-40497

    FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, FreeScout's removes , , , but does NOT strip tags. The mailbox signature field is saved via POST /mailbox/settin

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.