Account takeover via nonexpiring invitation hash
Published May 7, 2026 · Updated May 7, 2026
Insufficient invitation expiration in FreeScout before 1.8.217 allows remote attackers with a leaked invite hash to take over its account. The userSetupSave method in OpenController.php selects a user solely by invite_hash, never checks invitation age or state, then replaces the password and logs in the requester. Exploitation requires disclosure of an unconsumed 60-character invitation hash; an administrator invitation yields administrator access.
Summary
What happened
Insufficient invitation expiration in FreeScout before 1.8.217 allows remote attackers with a leaked invite hash to take over its account. The userSetupSave method in OpenController.php selects a user solely by invite_hash, never checks invitation age or state, then replaces the password and logs in the requester. Exploitation requires disclosure of an unconsumed 60-character invitation hash; an administrator invitation yields administrator access.
The record
- CVE
- CVE-2026-41902
- Published
- May 7, 2026
- Updated
- May 7, 2026
- Vendor
- FreeScout
- Product
- FreeScout
- Classifications
- CWE-613, T1078
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 7, 2026CVE publishedPublication date reported by the CVE source.
- May 7, 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.
- Affected versionversion=< 1.8.217
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
- Upstream unauthenticated invitation-hash takeover reproductionfunctional · demonstrated
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Technologies
Your stack
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Your stack
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