CVE-2026-1842
Token Misuse in HyperCloud Enables Prolonged Unauthorized Access
Publication date: 2026-02-20
Last updated on: 2026-02-20
Assigner: SoftIron
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| softiron | hypercloud | From 2.3.5 (inc) to 2.6.8 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-613 | According to WASC, "Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization." |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects HyperCloud versions 2.3.5 through 2.6.8, where refresh tokens were improperly allowed to be used directly for resource access.
Additionally, the system failed to invalidate previously issued access tokens when a refresh token was used.
Since refresh tokens have a much longer lifetime (default one year), an authenticated client could use a refresh token instead of an access token to maintain long-term access without the usual token rotation.
Moreover, old access tokens remained valid even after refresh, allowing concurrent or extended use beyond the intended session boundaries.
This means that if a token is disclosed, it could allow prolonged unauthorized access.
How can this vulnerability impact me? :
The vulnerability can lead to prolonged unauthorized access to resources because refresh tokens can be used directly for resource access without proper invalidation of old access tokens.
An attacker or unauthorized user who obtains a refresh token could maintain access for up to a year without needing to re-authenticate or rotate tokens.
This extended access increases the risk of data exposure, unauthorized actions, and potential compromise of sensitive systems.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know