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CVE-2023-41843VulnerabilityPublished Updated

CVE-2023-41843: Fortinet FortiSandbox · Execute unauthorized code or commands

Affects Fortinet FortiSandboxSource CVE Database V5

0

Not known to be exploited · CVSS 7.3 High.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score
7.3High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 49% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:X/RC:C

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Oct 2023

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

What to do

Affected software

ProductAffectedFixed in
Fortinet FortiSandboxAffected
  • =4.4.0
  • =4.2.0
  • =4.0.0
  • =3.2.0
  • =3.1.0
  • =3.0.0
  • =2.5.0
  • =2.4.1
Fixed in–

AI-suggested

Organizations should immediately verify their FortiSandbox versions and prioritize upgrading to patched versions once available from Fortinet. In the absence of patches, implement strict input validation and sanitization on any web interfaces exposed to users or external networks. Employ web application firewalls (WAFs) configured to detect and block XSS payloads targeting FortiSandbox interfaces. Limit access to FortiSandbox management consoles to trusted internal networks and enforce multi-factor authentication to reduce risk from user interaction-based attacks. Conduct regular security awareness training to educate users about the risks of clicking unknown links or visiting untrusted websites. Monitor network traffic and logs for unusual HTTP requests or signs of attempted exploitation. Network segmentation should be used to isolate FortiSandbox systems from critical assets to contain potential breaches. Finally, maintain up-to-date threat intelligence feeds to stay informed about emerging exploits targeting this vulnerability.

Description

CVE-2023-41843 is a high-severity cross-site scripting (XSS) vulnerability in multiple versions of Fortinet FortiSandbox, allowing attackers to execute unauthorized code or commands via crafted HTTP requests. The flaw arises from improper input neutralization during web page generation, affecting versions 2.4.1 through 4.4.1. Exploitation requires user interaction but no authentication, with potential impacts on confidentiality, integrity, and availability. Although no known exploits are currently in the wild, the vulnerability poses significant risk to organizations using FortiSandbox for advanced threat detection. European organizations relying on Fortinet products, especially in critical infrastructure and finance sectors, should prioritize patching and implement strict input validation and network segmentation. Countries with high Fortinet market penetration and strategic importance, such as Germany, France, the UK, and the Netherlands, are most likely to be affected.

References

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