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Renovate CVE-2026-88882

| EUVDEUVD-2026-75432 CRITICAL
URL Redirection to Untrusted Site (Open Redirect) (CWE-601)
2026-09-10 VulnCheck GHSA-978f-wwpx-5hh6
9.2
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.2 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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
vuln.today AI
6.8 MEDIUM

Requires a malicious/compromised registry (AC:H); no Renovate auth needed (PR:N); credentials cross a trust boundary to another host (S:C, C:H); no integrity or availability impact.

3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
POC Analysis Generated
Sep 10, 2026 - 15:25 vuln.today
Patch available
Sep 10, 2026 - 14:02 EUVD
Analysis Generated
Sep 10, 2026 - 13:57 vuln.today
CVE Published
Sep 10, 2026 - 13:05 cve.org
CRITICAL 9.2

DescriptionCVE.org

Renovate is a dependency update automation tool. In versions before 44.11.2 (and Mend Renovate CE/EE images and charts before 15.4.0, and mend-renovate-enterprise-edition helm chart before 10.4.0), when listing new package versions from a NuGet registry Renovate follows pagination URLs supplied by the registry in the HTTP Link header without verifying that the target has the same origin as the configured registry. Registry credentials are attached to the request for the 'next' page, so a malicious or compromised NuGet registry can return a Link header pointing at an attacker-controlled server and cause Renovate to send the registry credentials to that server. Exploitation requires the remote registry to be malicious or compromised; such a registry would normally already have received the credentials on the initial request, so the issue primarily allows the credentials to be delivered to an additional, attacker-chosen host. The fix restricts pagination to the same origin; the previous behaviour can be re-enabled with the RENOVATE_X_NUGET_PAGINATION_ALLOW_CROSS_ORIGIN option.

AnalysisAI

Credential exfiltration in Renovate before 44.11.2 (and Mend Renovate CE/EE images/charts before 15.4.0, enterprise-edition helm chart before 10.4.0) lets a malicious or compromised NuGet registry harvest the configured registry credentials by returning an HTTP Link header whose 'next' pagination URL points to an attacker-controlled host. Renovate followed cross-origin pagination targets without an origin check and re-attached the registry credentials, delivering them to an arbitrary attacker-chosen server. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target's Renovate to be configured to query a NuGet registry that is malicious or has been compromised, and to have registry credentials configured for that feed; the malicious registry must return an HTTP Link header with a cross-origin 'next' pagination URL. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The published CVSS 4.0 score is 9.2 with vector AV:N/AC:L/PR:N/UI:N/VC:H/SC:H, reflecting a network confidentiality breach with subsequent-system impact (credentials leaving their intended trust boundary). … 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 Vendor-released patch: upgrade Renovate to 44.11.2 or later, Mend Renovate CE/EE images and charts to 15.4.0 or later, and the mend-renovate-enterprise-edition Helm chart to 10.4.0 or later; the fix restricts NuGet pagination to the same origin as the configured registry. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all systems running Renovate and determine which connect to NuGet registries, checking against vulnerable versions: Renovate before 44.11.2, Mend CE/EE before 15.4.0, enterprise helm chart before 10.4.0. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-88882 vulnerability details – vuln.today

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