EUVD-2026-70494
GHSA-37pq-fmvf-2fwx
Severity by source
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/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
AV:A and AC:H because exploitation requires active adjacent-network interception; C:H and I:H for credential/intel theft and response injection; A:N as no availability impact is described.
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
Lifecycle Timeline
3DescriptionCVE.org
MISP contains an improper TLS certificate validation vulnerability in CurlClient. The CurlClient::$verifyPeer property was not explicitly initialized and therefore defaulted to null. When passed to cURL, this value effectively disabled TLS peer verification unless the calling code explicitly enabled it.
As a result, HTTPS connections made through affected CurlClient instances could accept certificates that were not issued by a trusted certificate authority. An attacker capable of intercepting or manipulating network traffic between a MISP instance and a remote HTTPS service could impersonate the remote endpoint and perform a man-in-the-middle attack.
Successful exploitation could allow an attacker to observe sensitive information transmitted by MISP, including authentication material or exchanged threat intelligence, and to modify responses returned to the MISP instance. The impact depends on the functionality using CurlClient and the data exchanged with the remote service.
The patch enables TLS peer verification by default while preserving explicit support for configured self-signed certificates. It also corrects the self-signed certificate handling in SyncTool so that peer verification is disabled only when no pinned CA certificate is configured.
AnalysisAI
Improper TLS certificate validation in MISP's CurlClient class allows an adjacent-network attacker to perform man-in-the-middle attacks against outbound HTTPS connections made by the MISP instance, including threat intelligence synchronization. The PHP property CurlClient::$verifyPeer was left uninitialized, defaulting to null, which cURL interprets as falsy and therefore disables peer certificate verification. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to be positioned on the same network segment as the MISP instance or capable of intercepting its routed traffic (AV:A - adjacent network vector), specifically targeting MISP's outbound HTTPS connections. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 7.6 with AV:A and AC:H accurately captures the primary constraint: exploitation requires the attacker to be positioned to actively intercept MISP's network traffic, a hands-on prerequisite that substantially limits opportunistic or mass exploitation. … 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 | Apply the upstream patch at https://github.com/MISP/MISP/commit/e06f69858, which initializes `CurlClient::$verifyPeer = true` by default and corrects the `SyncTool.php` cert_file presence check from `isset()` to `empty()`, preventing verification bypass when a configured CA certificate is subsequently removed. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Although no public exploit has been identified at time of analysis, threat intelligence integrity is critical. …
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Same weakness CWE-295 – Improper Certificate Validation
View allSame technique Information Disclosure
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External POC / Exploit Code
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