EUVD-2026-51236
GHSA-pjx9-wh57-j26p
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/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, low complexity; PR:N because attacker needs no credentials; UI:R because victim must authenticate; S:U and no A impact as no server-side execution occurs.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/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
Lifecycle Timeline
4DescriptionCVE.org
Leantime 3.6.2 contains an open redirect vulnerability in the Login controller that allows unauthenticated attackers to redirect authenticated users to arbitrary external sites by manipulating the redirectUrl POST parameter. Attackers can craft a malicious login URL with a tampered redirectUrl value that bypasses FILTER_SANITIZE_URL validation to redirect victims to attacker-controlled sites for phishing or credential theft.
AnalysisAI
Open redirect in Leantime 3.6.2's Login controller lets unauthenticated attackers craft login URLs where the redirectUrl POST parameter bypasses PHP's FILTER_SANITIZE_URL validation - which strips illegal characters but never performs origin-validation - to redirect authenticated users to external attacker-controlled sites. Affected are all deployments of Leantime 3.6.2 with a web-accessible login endpoint, the primary use case being phishing and credential theft by abusing the trusted Leantime domain as a delivery vehicle. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerability is triggered when an authenticated user follows an attacker-crafted Leantime login URL whose `redirectUrl` POST parameter contains an external or protocol-relative URL. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.1 (Medium) accurately reflects the bounded impact profile: network-accessible (AV:N), low complexity (AC:L), no attacker privileges required (PR:N), but mandatory active user interaction (UI:A - the victim must both receive the crafted link and successfully authenticate). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A publicly available POC exists per VulnCheck and GHSA-wprg-q8m6-jhp9. An attacker crafts a Leantime login URL with a `redirectUrl` POST parameter value set to an external phishing domain (e.g., `//evil-attacker.com/fake-leantime`) - bypassing `FILTER_SANITIZE_URL` - and delivers it to a target Leantime user via a spear-phishing email; the victim authenticates normally and is silently redirected to the attacker's site, which mimics the Leantime interface to harvest credentials or deliver further payloads under the guise of a legitimate post-login session. |
| Remediation | The upstream fix is available via GitHub PR #3658 (https://github.com/Leantime/leantime/pull/3658); organizations running Leantime 3.6.2 should apply the patch from this PR or update to any release that incorporates it - a specifically tagged patched release version is not independently confirmed at time of analysis, so verify the fix commit is included in any upgrade target. … Detailed patch versions, workarounds, and compensating controls in full report. |
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