EUVD-2026-55992
GHSA-x373-32xc-7gqv
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/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-reachable unauthenticated endpoint (PR:N confirmed); scope changes to internal network (S:C); confidentiality fully compromised via internal response exfiltration; no integrity or availability impact described.
Primary rating from Vendor (5a6e4751-2f3f-4070-9419-94fb35b644e8).
CVSS VectorVendor: 5a6e4751-2f3f-4070-9419-94fb35b644e8
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/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
Lifecycle Timeline
3DescriptionCVE.org
Affected versions of cti-transmute contain an SSRF vulnerability in the /fetch_misp_event and /misp_search_events endpoints.
The URL validation routine checked whether a supplied hostname was itself an IP literal and rejected private, loopback, link-local, or reserved IPs. However, ordinary domain names were accepted without resolving them first. An attacker could therefore use a hostname whose DNS record pointed to an internal address and cause the cti-transmute server to issue requests into its internal network. The commit explicitly states that anonymous callers could make the server request the internal target and read the response.
The fix resolves hostnames using socket.getaddrinfo(), checks that every resolved address is globally routable, and additionally places @login_required on both affected MISP fetch/search routes.
AnalysisAI
Server-Side Request Forgery in MISP's cti-transmute tool allows unauthenticated network attackers to leverage the /fetch_misp_event and /misp_search_events endpoints as a proxy into the server's internal network by supplying a domain name whose DNS record resolves to a private or reserved IP address. The validation logic checked IP literals against blocked ranges but unconditionally trusted domain names, creating a trivially exploitable DNS-bypass gap confirmed by the upstream commit to expose full internal response bodies to anonymous callers. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The /fetch_misp_event or /misp_search_events endpoints must be reachable by the attacker over the network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N) accurately reflects the pre-patch state: a zero-complexity, unauthenticated network call with confirmed ability to read internal service responses. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker with HTTP access to a cti-transmute instance registers a domain (e.g., internal-probe.attacker.com) and sets its DNS A record to point to an internal IP such as 192.168.1.1 or the AWS instance metadata endpoint at 169.254.169.254. The attacker sends a single HTTP request to /fetch_misp_event supplying internal-probe.attacker.com as the MISP URL; the server resolves the domain, passes it through the IP-literal-only validation check, and issues an outbound HTTPS request to the internal target, returning the response body to the attacker. … |
| Remediation | Update cti-transmute to a version that incorporates commit 4d29109a6f185d5e7c7f3b906f822ab34403f512 or later; this commit is the upstream fix reference at https://github.com/MISP/cti-transmute/commit/4d29109a6f185d5e7c7f3b906f822ab34403f512. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: immediately audit network exposure of MISP instances and restrict external access to the /fetch_misp_event and /misp_search_events endpoints using firewall rules or network segmentation; document all affected systems. …
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Same weakness CWE-918 – Server-Side Request Forgery (SSRF)
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External POC / Exploit Code
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