EUVD-2026-74954Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
AC:H reflects mandatory prerequisite (MitM/XSS/cookie injection); UI:R because victim must authenticate; C:H/I:H for full session hijack; A:N as no availability impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
tirreno, a security framework, has a session fixation issue in versions prior to 0.10.0. During authentication, tirreno validates the user's credentials and establishes the authenticated session, but it does not call session_regenerate_id() afterward. As a result, the session identifier is not rotated on login, it stays the same before and after authentication. An attacker able to fix a known session identifier in a victim's browser (for example through a network man-in-the-middle position, or a separate cross-site scripting or subdomain cookie-injection issue) could then gain access to the victim's authenticated session. The issue is fixed in v0.10.0. The session identifier is now regenerated on successful authentication, and the previous session is destroyed. There is no configuration-level workaround.
AnalysisAI
Session fixation in tirreno versions prior to 0.10.0 allows an attacker who can inject a known session identifier into a victim's browser to hijack that victim's authenticated session. The framework's authentication flow validates credentials and establishes a session but omits the PHP session_regenerate_id() call, so the same token that existed before login remains valid after it. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must have a mechanism to inject a controlled session cookie into the victim's browser before the victim authenticates. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 score of 5.3 (VC:N/VI:L) materially understates the realistic impact: a successful session fixation attack yields full account takeover - the attacker has the same access as the authenticated victim - which corresponds to C:H/I:H rather than the scored VC:N/VI:L. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to tirreno v0.10.0 or later, available at https://github.com/tirrenotechnologies/tirreno/releases/tag/v0.10.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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