CVE-2026-88880: Mend Mend-Renovate-CE

High severity, CVSS 8.6. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Mend Mend-Renovate-CE: before 15.4.0 (fixed in 15.4.0)
• Mend Mend-Renovate-Enterprise-Edition: before 10.4.0 (fixed in 10.4.0)
• Mend Renovate-CE: before 15.4.0 (fixed in 15.4.0)
• Mend Renovate-EE-Server: before 15.4.0 (fixed in 15.4.0)
• Mend Renovate-EE-Worker: before 15.4.0 (fixed in 15.4.0)
• Renovatebot Renovate: before 44.11.3 (fixed in 44.11.3)

Published 2026-09-10. Last modified 2026-09-29.