CVE-2026-58395
MEDIUM 4.3OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the safe-delete path reached through ApiMutableModelControllerBase::delBase() interpolates an unvalidated safe-delete token from the request URL into an XPath expression over config.xml before confirming that the token is a valid identifier. A user holding any one affected module privilege can send a crafted token to one of 21 affected delete endpoints covering Traffic Shaper, DHCP relay, Dnsmasq, Firewall Category, or Kea DHCP, causing the XPath to match configuration data across modules. The resulting error response exposes configuration item names, descriptions, reference paths, and UUIDs and provides an XPath substring-presence oracle, including for modules the user cannot otherwise access. The request does not modify configuration or perform a deletion. This issue is fixed in version 26.1.11.
No known exploitation, public exploit, or elevated probability at this time. Track for changes.
Exploitation likelihood
0.4%chance of exploitation in 30 days · 29th percentile
Impact if exploited
4.3CVSS 3.1 · MEDIUM
- ConfidentialityLow
- IntegrityNone
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires a low-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-643: : Improper Neutralization of Data within XPath Expressions ('XPath Injection')
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
References and research data (JSON)
All CVSS metrics
- MEDIUM 4.3 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - MEDIUM 4.3 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
References
Exploit-tagged references (not proof of a PoC)
- https://github.com/opnsense/core/security/advisories/GHSA-98h6-479q-9q3w CVE record · GitHub_M · Updated 2026-10-15T15:16:49.985Z
CVE record · CISA-ADP · Updated 2026-10-15T18:41:38.423Z
NVD · CVE-2026-58395 · Updated 2026-10-15T21:08:49.703
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-102116 EUVD · EUVD-2026-102116
Technical & other
- https://github.com/opnsense/core/commit/631e14721b311badc1d3c0d29321e4d42585156b CVE record · GitHub_M · Updated 2026-10-15T15:16:49.985Z
NVD · CVE-2026-58395 · Updated 2026-10-15T21:08:49.703 - https://github.com/opnsense/core/commit/d7054cef69f72588feac1091254960835be19dfe CVE record · GitHub_M · Updated 2026-10-15T15:16:49.985Z
NVD · CVE-2026-58395 · Updated 2026-10-15T21:08:49.703 - https://hackerask.com/posts/opnsense CVE record · GitHub_M · Updated 2026-10-15T15:16:49.985Z
NVD · CVE-2026-58395 · Updated 2026-10-15T21:08:49.703