EUVD-2026-78317
GHSA-fx6r-c922-6mvg
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/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
Network CSRF requiring authenticated victim interaction; PR:L because victim session needed; integrity-only impact on MISP data.
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
Lifecycle Timeline
2DescriptionCVE.org
Affected versions of MISP rely on CakePHP request-method override processing in a way that can disable CSRF and form-security validation.
CakePHP honors a _method field or X-HTTP-Method-Override header by rewriting the effective request method. For override values outside the normal write verbs POST, PUT, PATCH, and DELETE, CakePHP also clears the parsed request body. MISP’s security component then determines whether to perform _validatePost() and _validateCsrf() based on whether request data remains. With a value such as:
_method=GET
the body becomes empty before those checks run, so both protections are skipped. A cross-site form containing only that override can therefore reach actions whose parameters are taken from the URL rather than the request body
Version affected: ≤2.5.45
AnalysisAI
CSRF protection bypass in MISP ≤2.5.45 allows a network-adjacent attacker to forge authenticated state-changing requests against any MISP action that reads parameters from the URL. The bypass exploits CakePHP's method-override processing: submitting _method=GET (or an equivalent non-write verb via X-HTTP-Method-Override) causes CakePHP to empty the parsed request body before MISP's BetterSecurityComponent evaluates whether to run _validatePost() and _validateCsrf(). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must be authenticated to MISP (an active session cookie must be present, corresponding to PR:L in the CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.9 (AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N) accurately reflects the risk profile: network-reachable, low complexity, but requiring an authenticated victim who interacts with a crafted page. … 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 | Upstream fix is available as commit 29af008c4 in the MISP GitHub repository (https://github.com/MISP/MISP/commit/29af008c4). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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