CVE-2026-88881

HIGHPre-NVD 8.68.6—
EchelonGraph scoreHIGH confidence

Score 8.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-10. a secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.6Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Renovate, a dependency update tool, follows pagination links supplied by the GitHub server in the HTTP Link header when interacting with GitHub.com, GitHub Enterprise Cloud, or GitHub Enterprise Server, and sends the credentials configured for that host to the URL given as the 'next' page. Because the pagination URL is not validated against the host originally contacted, a malicious or compromised GitHub server can return a Link header pointing to an attacker-controlled host and cause Renovate to disclose those credentials to it. Exploitation requires that the GitHub server Renovate talks to (as the repository host or as a datasource such as github-releases, github-tags, or git-refs) is already malicious or compromised. The issue is fixed in renovate 44.11.3 (npm and renovate/renovate container images), Mend Renovate CE/EE images and the mend-renovate-ce helm chart 15.4.0, and the mend-renovate-enterprise-edition helm chart 10.4.0. There is no workaround; the pre-existing RENOVATE_X_REBASE_PAGINATION_LINKS option disables the new host check and should only be used with servers that intentionally use different pagination hosts.

CVSS v3
8.6
EG Score
8.6(high)
EG Risk
54(Track)
EG Risk 54/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity86% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 15, 2026

Advisory Details (2)

Auto-updated Sep 10, 2026
Patch available. Sources: github.
generic

Renovate before 44.11.3 Credential Exfiltration via Link Header | Advisories | VulnCheck

https://www.vulncheck.com/advisories/renovate-before-44.11.3-credential-exfiltration-via-link-header-2
github Patch Available

Malicious GitHub servers could send a malicious `Link` header to allow exflitrating credentials · Advisory · renovatebot/renovate · GitHub

https://github.com/renovatebot/renovate/security/advisories/GHSA-w57v-h33h-835c

Vendor Advisories for CVE-2026-88881(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 29× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-20 22:45 UTCEG score recompute
  2. 2026-09-20 22:45 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 10:25 UTCGHSA enrichment
  5. 2026-09-19 22:05 UTCEG score recompute
  6. 2026-09-19 22:04 UTCGHSA enrichment
  7. 2026-09-19 09:44 UTCGHSA enrichment
  8. 2026-09-18 21:19 UTCEG score recompute
  9. 2026-09-18 21:19 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 08:11 UTCGHSA enrichment
  12. 2026-09-17 19:51 UTCEG score recompute
  13. 2026-09-17 19:50 UTCGHSA enrichment
  14. 2026-09-17 19:32 UTCEPSS rescore
  15. 2026-09-17 04:38 UTCGHSA enrichment
  16. 2026-09-16 16:17 UTCEG score recompute
  17. 2026-09-16 16:17 UTCGHSA enrichment
  18. 2026-09-16 14:09 UTCEPSS rescore
  19. 2026-09-16 05:15 UTCEPSS rescore
  20. 2026-09-16 03:55 UTCGHSA enrichment
  21. 2026-09-15 15:34 UTCEG score recompute
  22. 2026-09-15 15:34 UTCGHSA enrichment
  23. 2026-09-15 14:35 UTCEG score recompute
  24. 2026-09-15 14:35 UTCGHSA enrichment
  25. 2026-09-15 06:36 UTCEG score recompute
Show 21 more
  1. 2026-09-15 06:36 UTCGHSA enrichment
  2. 2026-09-15 03:12 UTCEPSS rescore
  3. 2026-09-14 18:15 UTCGHSA enrichment
  4. 2026-09-14 05:22 UTCGHSA enrichment
  5. 2026-09-13 17:02 UTCEG score recompute
  6. 2026-09-13 17:02 UTCGHSA enrichment
  7. 2026-09-13 16:48 UTCEPSS rescore
  8. 2026-09-13 04:41 UTCGHSA enrichment
  9. 2026-09-12 16:22 UTCEG score recompute
  10. 2026-09-12 16:22 UTCGHSA enrichment
  11. 2026-09-12 15:02 UTCEPSS rescore
  12. 2026-09-12 04:02 UTCGHSA enrichment
  13. 2026-09-11 15:42 UTCEG score recompute
  14. 2026-09-11 15:42 UTCGHSA enrichment
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-11 03:17 UTCEG score recompute
  18. 2026-09-11 03:17 UTCGHSA enrichment
  19. 2026-09-10 14:19 UTCEG score recompute
  20. 2026-09-10 13:20 UTCEG score recompute
  21. 2026-09-10 13:20 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88881?
CVE-2026-88881 is a high vulnerability published on September 10, 2026. Renovate, a dependency update tool, follows pagination links supplied by the GitHub server in the HTTP Link header when interacting with GitHub.com, GitHub Enterprise Cloud, or GitHub Enterprise Server, and sends the credentials configured for that host to the URL given as the 'next' page. Because…
When was CVE-2026-88881 disclosed?
CVE-2026-88881 was first published in the National Vulnerability Database on September 10, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88881 actively exploited?
CVE-2026-88881 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 76.6% of all scored CVEs.
What is the CVSS score of CVE-2026-88881?
CVE-2026-88881 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-88881?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88881, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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