EUVD-2026-72343
GHSA-7q84-h6g5-j34g
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:N/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
Authenticated account required to store payload (PR:L); victim login triggers redirect (UI:R); impact is phishing misdirection only (I:L), no C or A impact.
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
Lifecycle Timeline
2DescriptionCVE.org
Affected versions of MISP validate the user-configurable homepage by checking only whether the supplied path begins with /. That check is insufficient because protocol-relative URLs such as //attacker.example also begin with / but resolve to an external origin in browsers.
The vulnerable homepage value can be stored as a user setting and later used by the post-login routing logic. The commit explicitly identifies //attacker.example as a payload that passed validation and was emitted to the Location header after login.
The fix introduces a shared InternalRedirectValidator that rejects URLs containing a host, scheme, userinfo, unsafe leading // or /\, malformed URLs, and control characters. It also revalidates homepage settings on read so legacy or internally written unsafe values cannot bypass the new storage-time validation.
Version affected: ≤2.5.45
AnalysisAI
Open redirect in MISP ≤2.5.45 allows authenticated users to store a protocol-relative URL (e.g., //attacker.example) as a custom homepage setting, bypassing a path validation check that only required a leading /. On login, the post-login routing logic in UsersController and NewsController emits the stored value verbatim to the browser's Location header, redirecting victims to attacker-controlled external origins. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid MISP account with at least user-level permissions sufficient to save the homepage UserSetting (PR:L in CVSS terms). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.0 score of 5.1 (AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N) accurately characterizes this as a moderate-severity, limited-impact issue. … 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 MISP to a version incorporating commit bd454f65a (any release after 2.5.45 that includes this commit). … Detailed patch versions, workarounds, and compensating controls in full report. |
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