CVE-2026-59860

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.4%, top 30% 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
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.7Exploit: None knownExposed: 0

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

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.3, Kiota is affected by a code-generation injection vulnerability in the C# XML documentation-comment sink (the description, externalDocs label, and externalDocs link fields emitted as /// … comments). When text from an OpenAPI description is written into single-line XML doc comments without stripping newline and Unicode line-terminator characters, an attacker can break out of the /// comment line and inject additional code into generated C# clients. This issue is fixed in version 1.29.1 and 1.32.3.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity87% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
70%
KEV
Not listed

Published

July 16, 2026

Last Modified

August 17, 2026

Advisory Details (4)

Auto-updated Jul 16, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

v1.32.3

Patch available: microsoft/kiota v1.32.3

https://github.com/microsoft/kiota/releases/tag/v1.32.3
github_commit

commit ebb632db90aa (microsoft/kiota)

Fix landed in microsoft/kiota commit ebb632db90aa — awaiting tagged release

https://github.com/microsoft/kiota/commit/ebb632db90aa8e3c20949337d9faa2720d64ca44
github_pr

fix(csharp): strip newlines from doc comment text to prevent code injection

Fix merged in microsoft/kiota PR #7831 on 2026-06-24 — awaiting tagged release

https://github.com/microsoft/kiota/pull/7831
github Patch Available

CVE Advisory: XML Doc-Comment Newline Breakout Code Injection in Kiota · Advisory · microsoft/kiota · GitHub

https://github.com/microsoft/kiota/security/advisories/GHSA-3hrf-2gc2-mx32

Vendor Advisories for CVE-2026-59860(1)

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

Affected Packages

(2 across 1 ecosystem)
NuGet(2)
PackageVulnerable rangeFixed inDependents
Microsoft.OpenApi.Kiota0.1.0-preview ... 1.9.1 (72 versions)1.32.3—
Microsoft.OpenApi.Kiota.Builder0.2.0-preview ... 1.9.1 (46 versions)1.32.3—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 54× 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. 2026-09-01 13:54 UTCEPSS rescore
  2. 2026-09-01 04:40 UTCEPSS rescore
  3. 2026-08-31 03:44 UTCEG score recompute
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  1. 2026-08-17 13:47 UTCEPSS rescore
  2. 2026-08-16 20:31 UTCEG score recompute
  3. 2026-08-16 14:56 UTCEPSS rescore
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  42. 2026-07-28 15:37 UTCEPSS rescore
  43. 2026-07-27 21:06 UTCEG score recompute
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  45. 2026-07-26 22:38 UTCEG score recompute
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  60. 2026-07-20 17:08 UTCEPSS rescore
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  63. 2026-07-18 10:04 UTCEPSS rescore
  64. 2026-07-17 07:02 UTCEG score recompute
  65. 2026-07-16 14:45 UTCEG score recompute
  66. 2026-07-16 14:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59860?
CVE-2026-59860 is a high vulnerability published on July 16, 2026. Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.3, Kiota is affected by a code-generation injection vulnerability in the C# XML documentation-comment sink (the description, externalDocs label, and externalDocs link fields emitted as /// … comments). When text from an…
When was CVE-2026-59860 disclosed?
CVE-2026-59860 was first published in the National Vulnerability Database on July 16, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59860 actively exploited?
CVE-2026-59860 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 29.8% of all scored CVEs.
What is the CVSS score of CVE-2026-59860?
CVE-2026-59860 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-59860?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59860, 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.

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