EUVD-2026-76990
GHSA-wr7p-6rrg-8m28
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/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 API requires only standard authentication (PR:L); scope changes because server reaches internal systems beyond its own trust boundary (S:C); confidentiality impact is high via metadata/internal service reads, no integrity or availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Open Notebook before 1.11.0 fails to validate the URL parameter in POST /api/sources endpoint, allowing authenticated users to perform server-side requests to internal services. Attackers can supply arbitrary URLs to read cloud metadata, internal network services, and localhost-bound services through the application server's direct HTTP requests.
AnalysisAI
Server-side request forgery in Open Notebook before 1.11.0 allows authenticated users to pivot through the application server to reach cloud instance metadata services, internal network hosts, and localhost-bound services by supplying arbitrary URLs to the POST /api/sources endpoint. The vulnerable parameter is passed directly to the server's HTTP client without any allowlist or blocklist validation, making the application a proxy for internal reconnaissance. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated session on the Open Notebook instance (PR:L - any registered user account suffices; no elevated role is needed). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N) accurately reflects the risk: network-reachable, low-complexity, requires only a standard authenticated session (PR:L), and yields high confidentiality impact on both the vulnerable system and subsequent internal systems (SC:H). … 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 to Open Notebook 1.11.0 or later, which introduces URL validation via validate_url() from api.credentials_service before any outbound fetch in the POST /api/sources handler; the patch commit is 9045ea50196927eac7de647bb5b7009349236fb4. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all instances of Open Notebook in your environment and document which versions are deployed, particularly in cloud or hybrid infrastructure. …
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External POC / Exploit Code
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