CVE-2026-1842
CVE-2026-1842 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-613.
Key facts
- Severity: Medium (CVSS 4.0 base score 6.2)
- EPSS exploit prediction: 0% (11th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-8367
- Weakness: CWE-613
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-1842?
- 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.
- How severe is CVE-2026-1842?
- CVE-2026-1842 has a CVSS 4.0 base score of 6.2, rated medium severity.
- Is CVE-2026-1842 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-1842?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-1842 have an EU (EUVD) identifier?
- Yes. CVE-2026-1842 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8367.
- When was CVE-2026-1842 published?
- CVE-2026-1842 was published on 2026-02-20 and last updated on 2026-06-17.
References
Other CWE-613 (Insufficient Session Expiration) vulnerabilities
- CVE-2024-8888 — Critical (CVSS 10.0): An attacker with access to the network where CIRCUTOR Q-SMT is located in its firmware version 1.0.4, could steal the…
- CVE-2026-46455 — Critical (CVSS 9.8): Insufficient Session Expiration vulnerability in Apache Camel Keycloak Component. The camel-keycloak security helper…
- CVE-2026-21622 — Critical (CVSS 9.8): Insufficient Session Expiration vulnerability in hexpm hexpm/hexpm ('Elixir.Hexpm.Accounts.PasswordReset' module)…
- CVE-2025-59786 — Critical (CVSS 9.8): 2N Access Commander version 3.4.2 and prior improperly invalidates session tokens, allowing multiple session cookies to…
- CVE-2026-26342 — Critical (CVSS 9.8): Tattile Smart+, Vega, and Basic device families firmware versions 1.181.5 and prior implement an authentication token…
- CVE-2026-1435 — Critical (CVSS 9.8): Not properly invalidated session vulnerability in Graylog Web Interface, version 2.2.3, due to incorrect management of…
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