CVE-2026-53595

CRITICALPre-NVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.9%, top 21% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
9.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.4Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.224, the public endpoint POST /user-setup/{hash}/{invite_sent_at} (OpenController@userSetupSave) selects the target account solely by its invite_hash column, then overwrites that account's email and password and logs in as it. No authentication, cookie, or prior session is required. After a user activates, FreeScout sets invite_hash to the empty string. On MySQL and MariaDB, VARCHAR equality ignores trailing spaces, so a single URL-encoded space (%20) matches the stored empty string and selects the lowest-id activated user. The expiry guard decrypts invite_sent_at with the target's password hash, but Helper::decrypt returns its raw input unchanged when decryption fails. A plaintext numeric value such as 9999999999 therefore passes the time-to-live check without any secret. The result is that an anonymous attacker sets the email and password of the lowest-id activated FreeScout account (a support agent, or an administrator if one was added by invitation) and authenticates as that account. Version 1.8.224 contains a fix.

CVSS v3
9.4
EG Score
9.4(medium)
EG Risk
73(Attend)
EG Risk 73/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity94% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
2%
EPSS %ILE
79%
KEV
Not listed

Published

July 20, 2026

Last Modified

July 21, 2026

Advisory Details (1)

Auto-updated Sep 6, 2026
Patch available. Sources: github.
github Patch Available

Anonymous account takeover via /user-setup empty invite_hash on MySQL · Advisory · freescout-help-desk/freescout · GitHub

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-jqj5-r72v-v29g

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

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  70. 2026-07-20 20:27 UTCMITRE cvelistV5first tracked

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-53595.yaml
    First seen Jan 1, 2026

    FreeScout < 1.8.224 - Invite Hash Authorization Bypass

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-53595?
CVE-2026-53595 is a critical vulnerability published on July 20, 2026. FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.224, the public endpoint POST /user-setup/{hash}/{invitesentat} (OpenController@userSetupSave) selects the target account solely by its invitehash column, then overwrites that account's email and…
When was CVE-2026-53595 disclosed?
CVE-2026-53595 was first published in the National Vulnerability Database on July 20, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53595 actively exploited?
CVE-2026-53595 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 21.0% of all scored CVEs.
What is the CVSS score of CVE-2026-53595?
CVE-2026-53595 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2026-53595?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53595, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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