# CVE-2026-127050: Backup Migration before 2.1.8 Path Traversal via PclZip Restore Fallback

Status: published. Published: 2026-11-12. Updated: 2026-11-12.

Backup Migration before 2.1.8 for WordPress contains a path traversal vulnerability in its PclZip restore fallback that allows an attacker to achieve arbitrary file write when an administrator restores a malicious backup archive on a server lacking the PHP zip extension. Attackers can craft a zip archive with entry names containing ".." sequences, which PclZip's extract() processes without the PCLZIP_OPT_EXTRACT_DIR_RESTRICTION option, writing a PHP file outside the intended extraction directory into the web-servable tree to achieve remote code execution.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://wordpress.org/plugins/backup-backup/#developers

## Affected products and versions

- inisev / Backup Migration: ≥ 0; < 2.1.8 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.1 (high); CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.4 (medium); CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-22

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://wordpress.org/plugins/backup-backup/#developers (CNA: VulnCheck; patch, release-notes)

- https://www.vulncheck.com/advisories/backup-migration-before-path-traversal-via-pclzip-restore-fallback (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-127050; retrieved 2026-11-12; source updated 2026-11-12

Revision: 680644afab4f92566b141dd3fa138b7ff69bd91b4472f593b1ffcffaa34a0633

Canonical: https://y2.dev/cve/CVE-2026-127050

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