What’s Vulnerable › Vulnerabilities
CVE-2026-1842: HyperCloud Improper Refresh Token Validation and Access Token Invalidation Allows Long-Term Unauthorized Access
- Severity: medium (CVSS 6.2 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-20 · updated 2026-06-17
- Weakness: CWE-613
Description
HyperCloud versions 2.3.5 through 2.6.8 improperly allowed refresh tokens to be used directly for resource access and failed to invalidate previously issued access tokens when a refresh token was used. Because refresh tokens have a significantly longer lifetime (default one year), an authenticated client could use a refresh token in place of an access token to maintain long-term access without token rotation. Additionally, old access tokens remained valid after refresh, enabling concurrent or extended use beyond intended session boundaries. This vulnerability could allow prolonged unauthorized access if a token is disclosed.
Affected products
- SoftIron HyperCloud: from 2.3.5 before 2.6.9 — fixed in 2.6.9
How to fix
Upgrade to a fixed version: SoftIron HyperCloud 2.6.9. Check the vendor advisory for mitigations.
References
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