CVE-2026-48810Public exploitNetwork attack vectorHinoki check available

Post-removal thread rewriting via missing mailbox check

Published May 29, 2026 · Updated May 29, 2026

Improper authorization in FreeScout before 1.8.221 allows remote authenticated users to rewrite prior thread bodies after mailbox removal. ThreadPolicy::edit checks authorship and PERM_EDIT_CONVERSATIONS but omits current mailbox membership before save_edit_thread stores the supplied body. Exploitation requires prior authorship of the message or note and continued edit permission; other content remains out of scope.

CVSS severity4.3
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper authorization in FreeScout before 1.8.221 allows remote authenticated users to rewrite prior thread bodies after mailbox removal. ThreadPolicy::edit checks authorship and PERM_EDIT_CONVERSATIONS but omits current mailbox membership before save_edit_thread stores the supplied body. Exploitation requires prior authorship of the message or note and continued edit permission; other content remains out of scope.

The record

CVE
CVE-2026-48810
Published
May 29, 2026
Updated
May 29, 2026
Vendor
FreeScout
Product
FreeScout
Classifications
CWE-285, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 29, 2026CVE publishedPublication date reported by the CVE source.
  2. May 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.8.221

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FreeScout · FreeScoutversion=< 1.8.221

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-285Improper Authorization
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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