EUVD-2026-68121
GHSA-f668-xfp8-vhf5
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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
Network-delivered attack requires victim to click a crafted link (UI:R); no attacker authentication needed; redirect-only impact bounds C and I to Low; no availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
pac4j-core before 6.5.6 contains an open redirect vulnerability in DefaultLogoutLogic.perform() that accepts backslash-prefixed logout redirect targets matching logoutUrlPattern. Attackers can craft logout links with backslash-prefixed external hosts that browsers normalize into network-path references, redirecting victims to attacker-controlled sites after logout.
AnalysisAI
Open redirect in pac4j-core before 6.5.6 allows network-accessible attackers to redirect authenticated users to attacker-controlled sites immediately after logout. DefaultLogoutLogic.perform() validated logout redirect targets against a URL pattern regex, but that regex did not exclude backslash characters; browsers normalize backslash-prefixed paths (e.g., \evil.com) into network-path references (//evil.com), bypassing the intended allow-list. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to follow a crafted logout URL containing a backslash-prefixed redirect parameter - attacker-controlled delivery of such a link via email, SMS, or embedded hyperlink is the prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.3 (Medium) with vector AV:N/AC:L/AT:N/PR:N/UI:P accurately reflects the real-world risk profile: network-exploitable with no attacker authentication required and low attack complexity, but contingent on victim interaction (clicking a crafted logout link). … 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 pac4j-core to version 6.5.6 or later, which is the vendor-confirmed fixed release. … Detailed patch versions, workarounds, and compensating controls in full report. |
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