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CVE-2026-71490

Status: DeferredHigh (7.1)—
Severity7.1High · CVSS 3.1
Exploitation probability0.38 %higher than 31% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.11, OPNsense\Core\ACL::hasPrivilege() appends a directly assigned comma-separated <priv> value as one string and then uses an exact comparison when checking user-config-readonly. A user directly assigned both a component write privilege and user-config-readonly can therefore be treated as lacking the read-only restriction, and MVC APIs protected by throwReadOnly() can persist configuration changes for that component. Group privileges are not affected by the same parser flaw because the group path already splits comma-separated values. This issue is fixed in version 26.1.11.

CVSS

Base score
7.1
Version
3.1
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
0.38 %
Percentile among all scored CVEs
31
Score date
10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

El vector AV:N/PR:L indica explotación remota con privilegios bajos; el atacante persiste cambios de configuración vía APIs con throwReadOnly() al burlar la restricción de solo lectura.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Network SegmentationVulnerability ScanningThreat Intelligence ProgramRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data Storage

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Opnsense — OpnsenseAI

CWEs

References

Show 5 references

Raw JSON (NVD)

Show
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          "version": "2.0.3",
          "timestamp": "2026-10-15T15:44:35.198725Z"
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  "lastModified": "2026-10-15T21:08:49.703",
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