CVE-2026-44195: CWE-307: Improper Restriction of Excessive Authentication Attempts in opnsense core
A logic flaw in OPNsense core versions prior to 26.1.7 allows an unauthenticated attacker to bypass the authentication failure lockout mechanism. By submitting a crafted username containing success keywords between brute-force attempts, the attacker can reset the failure counter for their IP address, preventing lockout. This vulnerability is identified as CWE-307 and has a CVSS score of 5.3 (medium severity). The issue is fixed in version 26.1.7.
AI Analysis
Technical Summary
CVE-2026-44195 describes an improper restriction of excessive authentication attempts in OPNsense core before version 26.1.7. The vulnerability arises from a logic flaw in the lockout_handler component, which allows an unauthenticated attacker to continuously reset the authentication failure counter for their IP address. This is achieved by injecting a crafted username containing success keywords such as "Accepted" or "Successful login" between brute-force attempts, thereby preventing the failure counter from reaching the lockout threshold. The vulnerability is fixed in OPNsense version 26.1.7.
Potential Impact
An attacker can bypass the authentication failure lockout mechanism, enabling continuous brute-force attempts without triggering account or IP lockout. This may lead to increased risk of unauthorized access attempts. The impact is limited to confidentiality (partial information disclosure potential) with no integrity or availability impact reported.
Mitigation Recommendations
Upgrade OPNsense core to version 26.1.7 or later, where this vulnerability is fixed. No other official remediation or temporary workaround is indicated. Patch status is confirmed fixed in 26.1.7.
CVE-2026-44195: CWE-307: Improper Restriction of Excessive Authentication Attempts in opnsense core
Description
A logic flaw in OPNsense core versions prior to 26.1.7 allows an unauthenticated attacker to bypass the authentication failure lockout mechanism. By submitting a crafted username containing success keywords between brute-force attempts, the attacker can reset the failure counter for their IP address, preventing lockout. This vulnerability is identified as CWE-307 and has a CVSS score of 5.3 (medium severity). The issue is fixed in version 26.1.7.
CVSS v3.1
Score 5.3medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-44195 describes an improper restriction of excessive authentication attempts in OPNsense core before version 26.1.7. The vulnerability arises from a logic flaw in the lockout_handler component, which allows an unauthenticated attacker to continuously reset the authentication failure counter for their IP address. This is achieved by injecting a crafted username containing success keywords such as "Accepted" or "Successful login" between brute-force attempts, thereby preventing the failure counter from reaching the lockout threshold. The vulnerability is fixed in OPNsense version 26.1.7.
Potential Impact
An attacker can bypass the authentication failure lockout mechanism, enabling continuous brute-force attempts without triggering account or IP lockout. This may lead to increased risk of unauthorized access attempts. The impact is limited to confidentiality (partial information disclosure potential) with no integrity or availability impact reported.
Mitigation Recommendations
Upgrade OPNsense core to version 26.1.7 or later, where this vulnerability is fixed. No other official remediation or temporary workaround is indicated. Patch status is confirmed fixed in 26.1.7.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-05T15:13:47.570Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a052a70cbff5d86103e0d82
Added to database: 05/14/2026, 01:50:40 UTC
Last enriched: 05/21/2026, 12:21:01 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 88
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