CVE-2026-50188

MEDIUMPre-NVD 6.96.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 79% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.9Exploit: NoneExposed: 0

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

Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites and plugins using the Kirby Http Remote class, including Remote::request(), Remote::get(), and Remote::post(), to send outgoing HTTP requests with untrusted data in the headers option could allow newline characters in a header value to inject a separate unintended request header to the remote service. This issue is fixed in versions 4.9.4 and 5.4.4.

CVSS v3
6.9
EG Score
6.9(medium)
EG Risk
—
EPSS
21.2%
KEV
Not listed

Published

June 18, 2026

Last Modified

July 10, 2026

Advisory Details (5)

Auto-updated Jul 9, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

Request header injection in `Http\Remote` · Advisory · getkirby/kirby · GitHub

https://github.com/getkirby/kirby/security/advisories/GHSA-4v4h-m2qq-ppgw
github_release Patch Available

5.4.4

Patch available: getkirby/kirby 5.4.4

https://github.com/getkirby/kirby/releases/tag/5.4.4
github_release Patch Available

4.9.4

Patch available: getkirby/kirby 4.9.4

https://github.com/getkirby/kirby/releases/tag/4.9.4
github_commit Patch Available

commit fad9cbd22c73 (getkirby/kirby)

Patch available: getkirby/kirby 4.9.4 (contains commit fad9cbd22c73)

https://github.com/getkirby/kirby/commit/fad9cbd22c73ed0fbd3aaf62310a8dcacfc007cd
github_commit Patch Available

commit aa33414e1669 (getkirby/kirby)

Patch available: getkirby/kirby 5.4.4 (contains commit aa33414e1669)

https://github.com/getkirby/kirby/commit/aa33414e1669e866cdd6f4decfae2a669e8bb828

Vendor Advisories for CVE-2026-50188(1)

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

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
getkirby/cms5.0.0 ... 5.4.3 (41 versions)5.4.4—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 19× 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. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-20 17:08 UTCEPSS rescore
  3. 2026-07-19 14:31 UTCEPSS rescore
  4. 2026-07-19 14:31 UTCEPSS rescore
  5. 2026-07-19 02:29 UTCEPSS rescore
  6. 2026-07-18 10:04 UTCEPSS rescore
  7. 2026-07-16 17:03 UTCEPSS rescore
  8. 2026-07-15 16:57 UTCEPSS rescore
  9. 2026-07-15 16:57 UTCEPSS rescore
  10. 2026-07-15 02:00 UTCEPSS rescore
  11. 2026-07-15 02:00 UTCEPSS rescore
  12. 2026-07-13 22:31 UTCEPSS rescore
  13. 2026-07-13 06:13 UTCEPSS rescore
  14. 2026-07-13 06:13 UTCEPSS rescore
  15. 2026-07-12 05:46 UTCEPSS rescore
  16. 2026-07-11 08:27 UTCEPSS rescore
  17. 2026-07-11 08:27 UTCEPSS rescore
  18. 2026-07-09 19:14 UTCEG score recompute▲ 6.90
  19. 2026-07-09 19:12 UTCMITRE cvelistV5CVSS v3 → 6.9 · CVSS v4 → 6.9
  20. 2026-06-18 15:08 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-50188?
CVE-2026-50188 is a medium vulnerability published on June 18, 2026. Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites and plugins using the Kirby Http Remote class, including Remote::request(), Remote::get(), and Remote::post(), to send outgoing HTTP requests with untrusted data in the headers option could allow newline…
When was CVE-2026-50188 disclosed?
CVE-2026-50188 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50188 actively exploited?
CVE-2026-50188 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-50188?
CVE-2026-50188 has a CVSS v3 base score of 6.9 (NVD).
How do I remediate CVE-2026-50188?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50188, 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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