CVE-2026-23758: GFI HelpDesk before 4.99.9 contains a stored cross-site scripting vulnerability in the ticket subject field th

Q: How do I fix CVE-2026-23758?

helpdesk: upgrade to 4.99.9. Exact commands for each OS are on this page.

Q: Is CVE-2026-23758 being exploited?

CVE-2026-23758 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-23758 affect?

CVE-2026-23758 affects helpdesk. Severity is medium (CVSS 5.4). GFI HelpDesk before 4.99.9 contains a stored cross-site scripting vulnerability in the ticket subject field that allows authenticated staff members to inject malicious JavaScript by manipulating the editsubject POST parameter. Attackers can

Q: How urgent is CVE-2026-23758?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2026-23758 is a medium-severity flaw (CVSS 5.4) affecting helpdesk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

GFI HelpDesk before 4.99.9 contains a stored cross-site scripting vulnerability in the ticket subject field that allows authenticated staff members to inject malicious JavaScript by manipulating the editsubject POST parameter. Attackers can inject XSS payloads through inadequate sanitization in Controller_Ticket.EditSubmit() that bypass the incomplete SanitizeForXSS() method to execute arbitrary JavaScript when other staff members or administrato

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 96%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-20
Last modified	2026-10-26

Publisher (CNA): VulnCheck · Vendor: gfi

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-20 18:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

gfi helpdesk UPGRADE

Affected: < 4.99.9

Fixed in: 4.99.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy helpdesk || rpm -q helpdesk || helpdesk --version

2. UPGRADE to 4.99.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade helpdesk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade helpdesk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-23758?

helpdesk: upgrade to 4.99.9. Exact commands for each OS are on this page.

Is CVE-2026-23758 being exploited?

CVE-2026-23758 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-23758 affect?

CVE-2026-23758 affects helpdesk. Severity is medium (CVSS 5.4). GFI HelpDesk before 4.99.9 contains a stored cross-site scripting vulnerability in the ticket subject field that allows authenticated staff members to inject malicious JavaScript by manipulating the editsubject POST parameter. Attackers can

How urgent is CVE-2026-23758?

Priority 20/100. No elevated risk signals yet.

Related CVEs

CVE-2026-23756 MEDIUM 5.4 UPGRADE GFI HelpDesk before 4.99.9 contains a stored cross-site scripting vulnerability in the Troubleshooter module w
CVE-2026-23757 MEDIUM 5.4 UPGRADE GFI HelpDesk before 4.99.10 contains a stored cross-site scripting vulnerability in the Reports module where t
CVE-2026-23752 MEDIUM 4.8 UPGRADE GFI HelpDesk before 4.99.9 contains a stored cross-site scripting vulnerability in the template group creation
CVE-2026-23753 MEDIUM 4.8 UPGRADE GFI HelpDesk before 4.99.9 contains a stored cross-site scripting vulnerability in the language management fun

References

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