Vulnerability · Published Sep 10, 2026 · Assigned by VulnCheck
CVE-2026-88880Renovate before 44.11.3 Credential Exfiltration via Link Header
High 8.6
In plain English
A high-severity open redirect in mend-renovate-ce from mend. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Severity (CVSS 3.1)8.6High
Exploit odds (30 days)0.5%top 56.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| renovatebot | renovate | 0 – before 44.11.3 |
| mend | renovate-ce | 0 – before 15.4.0 |
| mend | renovate-ee-server | 0 – before 15.4.0 |
| mend | renovate-ee-worker | 0 – before 15.4.0 |
| mend | mend-renovate-ce | 0 – before 15.4.0 |
| mend | mend-renovate-enterprise-edition | 0 – before 10.4.0 |
Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
References
- GitHub Security Advisory (GHSA-9hmg-9h89-jhmx) vendor-advisory
- VulnCheck Advisory: Renovate before 44.11.3 Credential Exfiltration via Link Header third-party-advisory