What is CVE-2026-88880?

CVE-2026-88880 is a high-severity vulnerability in Renovatebot Renovate, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 8.6/10. Published 2026-09-10.

How severe is CVE-2026-88880?

High severity. CVSS v3 base score is 8.6 out of 10.

Open Redirect in Renovatebot Renovate

CVE-2026-88880

Renovate before 44.11.3 fails to validate Link header destinations when following GitLab server pagination, allowing malicious servers to redirect credential-bearing requests. Attackers controlling a compromised GitLab server can specify a Link header pointing to attacker-controlled infrastructure to exfiltrate authentication credentials.

Vulnerability class: Open Redirect

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

Affected products

Renovatebot Renovate

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-88880?: CVE-2026-88880 is a high-severity vulnerability in Renovatebot Renovate, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 8.6/10. Published 2026-09-10.
How severe is CVE-2026-88880?: High severity. CVSS v3 base score is 8.6 out of 10.