Check Point Security Gateway Improper Authentication
CVE-2026-50751 is a critical-severity improper authentication vulnerability in Quantum Security Gateway from Check Point, with a CVSS 3.1 base score of 9.3 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Quantum Security Gateway versions: R82.10 with Jumbo Hotfix Take 19 or below; R82 with Jumbo Hotfix Take 103 or below; R81.20 with Jumbo Hotfix Take 141 or below, and others listed below. The record does not name a fixed version, so check the vendor advisory. CISA added it to the Known Exploited Vulnerabilities catalogue on June 8, 2026, which means attacks have been observed in the wild, including in ransomware campaigns.
Attackers are already exploiting this vulnerability, according to CISA.
What to do
- Update Gaia OS to r81.20 or a later version.
- Update Gaia Embedded to r81.10.17 or r82.00.10, whichever matches your release line, or a later version.
- CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Read the advisory on support.checkpoint.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Check Point | Quantum Security Gateway | R82.10 with Jumbo Hotfix Take 19 or below; R82 with Jumbo Hotfix Take 103 or below; R81.20 with Jumbo Hotfix Take 141 or below; R81.10, R81, and R80.40 | Not stated |
| Check Point | Spark Firewalls | R80.20.X, R81.10.X, and R82.00.X | Not stated |
| Check Point | Gaia OS | r80.40 up to, but not including, r81.20; r81.20; r82; r82.10 | r81.20 |
| Check Point | Gaia Embedded | r80.20.00 up to, but not including, r81.10.17; r81.10.17; r80.20.00 up to, but not including, r82.00.10; r82.00.10 | r81.10.17, r82.00.10 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- LowLimited modification of data is possible.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N. Scored by CISA (ADP).
Official description
A logic flow weakness in Remote Access and Mobile Access certificate validation in deprecated IKEv1 key exchange allows an unauthenticated remote attacker to bypass user authentication and establish a remote access VPN connection without a valid user password.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
How developers prevent this class of flaw
- Use an authentication framework or library such as the OWASP ESAPI Authentication feature.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: active, automatable: yes, technical impact: total).
- Added to CISA's Known Exploited Vulnerabilities catalogue.
- Deadline for US federal agencies to remediate, set by CISA.
- Record last changed materially (score, affected products, status or references).
References
Advisories
Third-party and government advisories
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-50751US Government Resource
Other vulnerabilities in Quantum Security Gateway
- 7.8 High severity
- 7.3 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.5 High severity
- 7.4 High severity
Recent Improper Authentication vulnerabilities
- 7.0 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 8.3 High severity
- 8.6 High severity
- 8.8 High severity
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