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CVE-2026-44195

OPNsense: Authentication lockout bypass

Published: May 13, 2026Updated: May 15, 2026 Sources: CVE List NVDCWE-307
5.3MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 76.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
OpenVAS

Description

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.7, a logic flaw in the OPNsense lockout_handler allows an unauthenticated attacker to continuously reset the authentication failure counter for their IP address. By interjecting a crafted username containing a success keyword ("Accepted" or "Successful login") between normal brute-force attempts, an attacker can prevent the failure counter from ever reaching the lockout threshold. This vulnerability is fixed in 26.1.7.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-307

Affected Products

opnsense
oss-project
coreOn-prem
Networking Infrastructure / firewall
opnsenseOn-prem
Networking Infrastructure / firewall

Exploitability

Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Credential Access
View detailed technique mapping

References

https://github.com/opnsense/core/security/advisories/GHSA-h3vx-4q27-rc42
github.com
https://gist.github.com/sopex/b9786e72e2a5d9b1bbd81ed8477c351b
gist.github.com
News mentions
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