CVE-2026-58391

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Source
https://cve.org/CVERecord?id=CVE-2026-58391
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58391.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-58391
Aliases
  • GHSA-2xrm-p255-p43h
Published
2026-10-15T15:12:08Z
Modified
2026-10-16T02:48:01Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
OPNsense: Stored XSS in Firewall Rules/NAT pages via a HTML-attribute breakout
Details

OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, Firewall Rules and NAT views place stored category names and alias descriptions into HTML title attributes in filter_rule.volt and nat_rule.volt without quote-safe encoding. The response layer uses ENT_NOQUOTES, so a double quote survives and closes the attribute, allowing an event-handler attribute to be added to the existing span. A user with Firewall Categories or Firewall Alias Edit privileges can store a category name or alias description; the category must be assigned to a filter or NAT rule, or the alias must be referenced by a rule source or destination, and the rule must be saved so the affected tooltip is rendered. Script then executes in the session of an administrator or other user who opens the affected Rules or NAT page. The script can access CSRF material and perform authenticated actions as the victim. This issue is fixed in version 26.1.11.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-79",
        "CWE-83"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58391.json"
}
References

Affected packages

Git / github.com/opnsense/core

Affected ranges

Type
GIT
Repo
https://github.com/opnsense/core
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
c930ab586ffe2d2e010e5135657e5e054316ff58
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "26.1.11"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

15.*
15.1
15.1.1
15.1.10
15.1.10.2
15.1.11
15.1.11.1
15.1.11.2
15.1.11.3
15.1.11.4
15.1.12
15.1.2
15.1.3
15.1.4
15.1.5
15.1.6
15.1.6.1
15.1.7
15.1.7.1
15.1.7.2
15.1.8
15.1.8.1
15.1.8.2
15.1.8.3
15.1.8.4
15.1.9
15.1.9.1
15.1.9.2
15.7
16.*
16.7.a
16.7.b
16.7.r
17.*
17.1.a
17.1.b
17.1.r
17.7.a
17.7.b
17.7.r
18.*
18.1.a
18.1.b
18.1.r
18.7.a
18.7.b
18.7.r
19.*
19.1.a
19.1.b
19.1.r
19.7.a
19.7.b
19.7.r
20.*
20.1.a
20.1.b
20.1.r
20.7.a
20.7.b
20.7.r
21.*
21.1.a
21.1.b
21.1.r
21.7.a
21.7.b
21.7.r
22.*
22.1.a
22.1.b
22.1.r
22.7.a
22.7.b
22.7.r
23.*
23.1.a
23.1.b
23.1.r
23.7.a
23.7.b
23.7.r
24.*
24.1.a
24.1.b
24.1.r
24.7.a
24.7.b
24.7.r
25.*
25.1.a
25.1.b
25.1.r
25.7.a
25.7.b
25.7.r
26.*
26.1
26.1.1
26.1.10
26.1.2
26.1.3
26.1.4
26.1.5
26.1.6
26.1.7
26.1.8
26.1.9
26.1.a
26.1.b
26.1.r
26.1.r1
26.1.r2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58391.json"