CVE-2026-44503

HIGHNVD 7.07.0—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.0 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 61% 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, nvd
Elevated
7.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.0Exploit: NoneExposed: 0

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

The RedirectHandler middleware in microsoft/kiota-java (com.microsoft.kiota:microsoft-kiota-http-okHttp v1.9.0) and other Kiota libraries fails to strip sensitive HTTP headers when following 3xx redirects to a different host or scheme. Only the Authorization header is removed; Cookie, Proxy-Authorization, and all custom headers are forwarded to the redirect target.

CVSS v3
7.0
EG Score
7.0(medium)
EPSS
39.6%
KEV
Not listed

Published

May 14, 2026

Last Modified

May 14, 2026

Advisory Details (1)

Auto-updated Jun 11, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Kiota abstractions RedirectHandler leaks Cookie/Proxy-Authorization headers on cross-host redirect · Advisory · microsoft/kiota-java · GitHub

https://github.com/microsoft/kiota-java/security/advisories/GHSA-7j59-v9qr-6fq9

Affected Packages

(5 across 5 ecosystems)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/microsoft/kiota-http-go—1.5.5—
Maven(1)
PackageVulnerable rangeFixed inDependents
com.microsoft.kiota:microsoft-kiota-abstractions0.1.2 ... 1.9.0 (80 versions)1.9.1—
npm(1)
PackageVulnerable rangeFixed inDependents
kiota-typescript—1.0.0-preview.100—
NuGet(1)
PackageVulnerable rangeFixed inDependents
Microsoft.Kiota.Abstractions1.0.0 ... 1.9.9 (88 versions)1.22.0—
PyPI(1)
PackageVulnerable rangeFixed inDependents
microsoft-kiota-http0.1.0 ... 1.9.8 (53 versions)1.9.9—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 48× 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.

Showing the most recent 100 of 105 total refreshes for this CVE.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
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  1. 2026-06-22 14:25 UTCEPSS rescore
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  26. 2026-06-11 14:00 UTCEPSS rescore
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  32. 2026-06-10 10:59 UTCEG score recompute
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  36. 2026-06-08 14:17 UTCEPSS rescore
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  40. 2026-06-07 15:25 UTCEPSS rescore
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  42. 2026-06-07 13:09 UTCEG score recompute
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  63. 2026-06-01 13:52 UTCEPSS rescore
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  66. 2026-05-31 00:16 UTCEPSS rescore
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  74. 2026-05-26 13:44 UTCEPSS rescore
  75. 2026-05-26 07:18 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-44503?
CVE-2026-44503 is a high vulnerability published on May 14, 2026. The RedirectHandler middleware in microsoft/kiota-java (com.microsoft.kiota:microsoft-kiota-http-okHttp v1.9.0) and other Kiota libraries fails to strip sensitive HTTP headers when following 3xx redirects to a different host or scheme. Only the Authorization header is removed; Cookie,…
When was CVE-2026-44503 disclosed?
CVE-2026-44503 was first published in the National Vulnerability Database on May 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44503 actively exploited?
CVE-2026-44503 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 39.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44503?
CVE-2026-44503 has a CVSS v3 base score of 7.0 (NVD).
How do I remediate CVE-2026-44503?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44503, 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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