CVE-2026-59859

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 1.32.4, Kiota's PHP generator embedded OpenAPI description, default fields, property names, and other schema-derived strings into PHP double-quoted literals through SanitizeDoubleQuote() in Writers/StringExtensions.cs without escaping $, allowing attacker-controlled ${...}, $var, or {$obj->prop} interpolation constructs to inject arbitrary PHP code into generated model and request-builder classes. This issue is fixed in version 1.29.1 and 1.32.4.

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

v1.32.4

Patch available: microsoft/kiota v1.32.4

https://github.com/microsoft/kiota/releases/tag/v1.32.4
github_commit

commit 5e2a211ac426 (microsoft/kiota)

Fix landed in microsoft/kiota commit 5e2a211ac426 — awaiting tagged release

https://github.com/microsoft/kiota/commit/5e2a211ac4261988fbdc72c3b268596ea8837b87
github_pr

fix(php): Escape $ in double-quoted string literals to prevent code injection

Fix merged in microsoft/kiota PR #7863 on 2026-06-25 — awaiting tagged release

https://github.com/microsoft/kiota/pull/7863
github Patch Available

CVE Advisory: Code Generation Literal Injection in Kiota PHP Generator · Advisory · microsoft/kiota · GitHub

https://github.com/microsoft/kiota/security/advisories/GHSA-jqwh-526h-c92j

Vendor Advisories for CVE-2026-59859(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 (73 versions)1.32.4—
Microsoft.OpenApi.Kiota.Builder0.2.0-preview ... 1.9.1 (46 versions)1.32.4—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× 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 03:43 UTCEG score recompute
  4. 2026-08-30 19:17 UTCEPSS rescore
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  6. 2026-08-30 01:22 UTCEPSS rescore
  7. 2026-08-28 21:42 UTCEPSS rescore
  8. 2026-08-28 01:50 UTCEG score recompute
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-26 23:43 UTCEG score recompute
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  12. 2026-08-25 23:51 UTCEG score recompute
  13. 2026-08-25 13:49 UTCEPSS rescore
  14. 2026-08-24 21:52 UTCEG score recompute
  15. 2026-08-24 10:08 UTCEG score recompute
  16. 2026-08-23 10:40 UTCEG score recompute
  17. 2026-08-23 00:19 UTCEPSS rescore
  18. 2026-08-22 11:13 UTCEG score recompute
  19. 2026-08-21 23:49 UTCEPSS rescore
  20. 2026-08-20 23:23 UTCEG score recompute
  21. 2026-08-20 22:55 UTCEPSS rescore
  22. 2026-08-19 23:56 UTCEG score recompute
  23. 2026-08-19 17:04 UTCEPSS rescore
  24. 2026-08-18 19:56 UTCEG score recompute
  25. 2026-08-18 13:48 UTCEPSS rescore
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  1. 2026-08-17 15:21 UTCEG score recompute
  2. 2026-08-17 13:47 UTCEPSS rescore
  3. 2026-08-17 01:15 UTCEG score recompute
  4. 2026-08-16 14:56 UTCEPSS rescore
  5. 2026-08-16 13:31 UTCEG score recompute
  6. 2026-08-16 02:14 UTCEPSS rescore
  7. 2026-08-15 02:19 UTCEG score recompute
  8. 2026-08-15 01:30 UTCEPSS rescore
  9. 2026-08-14 02:51 UTCEG score recompute
  10. 2026-08-13 22:00 UTCEPSS rescore
  11. 2026-08-12 15:39 UTCEG score recompute
  12. 2026-08-12 13:51 UTCEPSS rescore
  13. 2026-08-11 16:12 UTCEG score recompute
  14. 2026-08-11 04:28 UTCEG score recompute
  15. 2026-08-11 00:00 UTCEPSS rescore
  16. 2026-08-09 17:02 UTCEG score recompute
  17. 2026-08-09 13:46 UTCEPSS rescore
  18. 2026-08-08 17:34 UTCEG score recompute
  19. 2026-08-08 16:37 UTCEPSS rescore
  20. 2026-08-07 18:07 UTCEG score recompute
  21. 2026-08-06 18:39 UTCEG score recompute
  22. 2026-08-06 13:47 UTCEPSS rescore
  23. 2026-08-06 06:55 UTCEG score recompute
  24. 2026-08-05 19:17 UTCEPSS rescore
  25. 2026-08-04 19:41 UTCEG score recompute
  26. 2026-08-04 15:10 UTCEPSS rescore
  27. 2026-08-04 10:39 UTCEPSS rescore
  28. 2026-08-03 19:34 UTCEG score recompute
  29. 2026-08-03 10:36 UTCEPSS rescore
  30. 2026-08-02 08:23 UTCEG score recompute
  31. 2026-08-02 02:27 UTCEPSS rescore
  32. 2026-08-01 08:55 UTCEG score recompute
  33. 2026-08-01 04:16 UTCEPSS rescore
  34. 2026-07-30 21:40 UTCEG score recompute
  35. 2026-07-30 16:28 UTCEPSS rescore
  36. 2026-07-30 08:07 UTCEG score recompute
  37. 2026-07-30 01:30 UTCEPSS rescore
  38. 2026-07-30 01:30 UTCEPSS rescore
  39. 2026-07-29 19:39 UTCEG score recompute
  40. 2026-07-29 18:53 UTCEG score recompute
  41. 2026-07-28 23:30 UTCEG score recompute
  42. 2026-07-28 15:37 UTCEPSS rescore
  43. 2026-07-27 22:53 UTCEG score recompute
  44. 2026-07-27 14:14 UTCEPSS rescore
  45. 2026-07-26 23:09 UTCEG score recompute
  46. 2026-07-26 14:54 UTCEPSS rescore
  47. 2026-07-26 14:54 UTCEPSS rescore
  48. 2026-07-26 11:26 UTCEG score recompute
  49. 2026-07-25 14:18 UTCEPSS rescore
  50. 2026-07-25 14:18 UTCEPSS rescore
  51. 2026-07-24 14:18 UTCEPSS rescore
  52. 2026-07-24 14:18 UTCEPSS rescore
  53. 2026-07-23 14:18 UTCEPSS rescore
  54. 2026-07-23 14:18 UTCEPSS rescore
  55. 2026-07-23 03:21 UTCEG score recompute
  56. 2026-07-22 14:08 UTCEPSS rescore
  57. 2026-07-22 14:08 UTCEPSS rescore
  58. 2026-07-21 15:25 UTCEPSS rescore
  59. 2026-07-21 15:25 UTCEPSS rescore
  60. 2026-07-20 17:08 UTCEPSS rescore
  61. 2026-07-19 14:31 UTCEPSS rescore
  62. 2026-07-19 02:29 UTCEPSS rescore
  63. 2026-07-18 10:04 UTCEPSS rescore
  64. 2026-07-16 14:45 UTCEG score recompute
  65. 2026-07-16 14:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59859?
CVE-2026-59859 is a high vulnerability published on July 16, 2026. Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.4, Kiota's PHP generator embedded OpenAPI description, default fields, property names, and other schema-derived strings into PHP double-quoted literals through SanitizeDoubleQuote() in Writers/StringExtensions.cs without…
When was CVE-2026-59859 disclosed?
CVE-2026-59859 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-2026-59859 actively exploited?
CVE-2026-59859 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-2026-59859?
CVE-2026-59859 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-59859?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59859, 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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