OPNsense up to 26.7.7 Lockout lockout_handler username neutralization for logs

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k1.16

Summaryinfo

A vulnerability identified as critical has been detected in OPNsense up to 26.7.7. Affected by this vulnerability is the function lockout_handler of the component Lockout Handler. The manipulation of the argument Username leads to neutralization for logs. This vulnerability is documented as CVE-2026-119423. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in OPNsense up to 26.7.7. It has been rated as critical. This issue affects the function lockout_handler of the component Lockout Handler. The manipulation of the argument username with an unknown input leads to a neutralization for logs vulnerability. Using CWE to declare the problem leads to CWE-117. The product does not neutralize or incorrectly neutralizes output that is written to logs. Impacted is availability. The summary by CVE is:

OPNsense core before 26.7.8 contains a log injection vulnerability that allows unauthenticated attackers to plant victim IP addresses in the lockout_handler by submitting crafted WebGUI login usernames. Attackers can submit usernames like 'Invalid user <victim-ip>' repeatedly to add the victim to the sshlockout table, blocking SSH and WebGUI access and killing its pf states.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-119423 since 10/30/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 26.7.8 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Neutralization for logs
CWE: CWE-117 / CWE-116 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OPNsense 26.7.8

Timelineinfo

10/30/2026 Advisory disclosed
10/30/2026 +0 days CVE reserved
10/30/2026 +0 days VulDB entry created
10/30/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CNA: VulnCheck
CVE: CVE-2026-119423 (🔒)

GCVE (CVE): GCVE-0-2026-119423
GCVE (VulDB): GCVE-100-429011

Entryinfo

Created: 10/30/2026 12:49
Changes: 10/30/2026 12:49 (77)
Complete: 🔍
Cache ID: 216::103

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