Insufficient Session Expiration Affecting hydrooj package, versions >=4.10.4 <5.0.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published4 Jul 2026
- disclosed18 Jun 2026
- creditUnknown
Introduced: 18 Jun 2026
CVE-2026-55617 (opens in a new tab)How to fix?
Upgrade hydrooj to version 5.0.2 or higher.
Overview
Affected versions of this package are vulnerable to Insufficient Session Expiration in the session recreation process. An attacker can gain unauthorized access to a user's account by replaying a previously valid session cookie after logout or session renewal. This is only exploitable if the attacker has obtained a stale session cookie associated with the victim.
Workaround
This vulnerability can be mitigated by forcing all existing sessions to expire or by clearing the server-side session token store after applying a local patch. Administrators should also review logs for suspicious use of stale session cookies and rotate any exposed session cookies.