EUVD-2026-34264
GHSA-mqm2-jjx4-44gx
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:H/SI:H/SA:H/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
Primary rating from Vendor (CIRCL) · only source for this CVE.
CVSS VectorVendor: CIRCL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:H/SI:H/SA:H/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
A logic error in the MISP CRUD component delete handler allowed validation failures to be bypassed when requests used the HTTP DELETE method. Due to missing parentheses in the delete condition, the expression was evaluated as ($validationError === null && POST) || DELETE, meaning a DELETE request could proceed even when the delete validation callback had rejected the operation. An authenticated attacker with access to an affected delete endpoint could abuse this flaw to delete records that should have been protected by application-level validation or authorization checks.
AnalysisAI
Authorization bypass in MISP versions through 2.5.38 lets authenticated users delete records via HTTP DELETE requests even after the application's delete-validation callback has rejected the operation. The root cause is an operator-precedence bug in the CRUDComponent::delete() handler where missing parentheses caused validation checks to be skipped for the DELETE method. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker needs an authenticated session on the target MISP instance and network reachability to a controller endpoint that uses CRUDComponent::delete() AND relies on the delete validation callback (rather than upfront ACL checks) to forbid the operation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mixed. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated MISP user - for example, a low-privileged community member on a shared instance - identifies a CRUD-backed delete endpoint protected by a model-level validation callback (such as one that forbids deleting records owned by another organisation). They issue an HTTP DELETE request to that endpoint; the operator-precedence bug causes the rejected validation result to be ignored, and the record is deleted. … |
| Remediation | Upgrade MISP to the first release that contains commit a5877559dc88ad7a0c935910a652c130489ae2bd (the parenthesisation fix in CRUDComponent::delete); per the input data this is an upstream fix available on GitHub, with the released patched version not independently confirmed beyond 'a version newer than 2.5.38'. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all MISP instances in production and document current versions. …
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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