CVE-2026-59895

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (23rd percentile of EPSS-scored CVEs). 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
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.0.0 before 4.12.27, cx() in hono/css composes class names from plain strings but marks the result as already escaped without HTML-escaping the input, allowing untrusted className values used in a JSX class attribute during server-side rendering to break out of the attribute and inject arbitrary markup. This issue is fixed in version 4.12.27.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100CISA SSVC

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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
23rd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 8, 2026

Last Modified

July 10, 2026

Advisory Details (3)

Auto-updated Jul 8, 2026
Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)

Server-Side XSS via JSX Escaping Bypass in cx() Utility · Advisory · honojs/hono · GitHub

https://github.com/honojs/hono/security/advisories/GHSA-w62v-xxxg-mg59
github_release Patch Available

v4.12.27

Patch available: honojs/hono v4.12.27

https://github.com/honojs/hono/releases/tag/v4.12.27
github_commit Patch Available

commit cd3f6f7194f0 (honojs/hono)

Patch available: honojs/hono v4.12.27 (contains commit cd3f6f7194f0)

https://github.com/honojs/hono/commit/cd3f6f7194f0e5c9d4b26ae0cf232018d0f388fc

Vendor Advisories for CVE-2026-59895(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)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
hono—
  • 4.0.0 up to 4.12.27: fixed in 4.12.27
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 30× 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 128 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
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  8. 2026-10-02 17:56 UTCEPSS rescore
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  10. 2026-10-01 16:11 UTCEG score recompute
  11. 2026-09-30 15:03 UTCEPSS rescore
  12. 2026-09-29 15:22 UTCEPSS rescore
  13. 2026-09-28 13:51 UTCEPSS rescore
  14. 2026-09-28 13:22 UTCEG score recompute
  15. 2026-09-27 13:48 UTCEPSS rescore
  16. 2026-09-26 15:59 UTCEPSS rescore
  17. 2026-09-24 14:04 UTCEPSS rescore
  18. 2026-09-23 06:10 UTCEG score recompute
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 05:43 UTCEG score recompute
  22. 2026-09-17 19:31 UTCEPSS rescore
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  24. 2026-09-16 05:15 UTCEPSS rescore
  25. 2026-09-15 03:11 UTCEPSS rescore
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  1. 2026-09-14 11:15 UTCEG score recompute
  2. 2026-09-13 16:47 UTCEPSS rescore
  3. 2026-09-13 08:25 UTCEG score recompute
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  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-10 09:35 UTCEPSS rescore
  7. 2026-09-08 22:01 UTCEPSS rescore
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-05 22:48 UTCEG score recompute
  11. 2026-09-04 05:07 UTCEPSS rescore
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  13. 2026-09-01 13:54 UTCEPSS rescore
  14. 2026-09-01 04:40 UTCEPSS rescore
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 07:33 UTCEG score recompute
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  18. 2026-08-28 21:42 UTCEPSS rescore
  19. 2026-08-27 21:50 UTCEG score recompute
  20. 2026-08-27 14:25 UTCEPSS rescore
  21. 2026-08-26 14:46 UTCEPSS rescore
  22. 2026-08-26 08:24 UTCEG score recompute
  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-24 23:48 UTCEG score recompute
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  26. 2026-08-23 00:19 UTCEPSS rescore
  27. 2026-08-22 19:43 UTCEG score recompute
  28. 2026-08-21 23:49 UTCEPSS rescore
  29. 2026-08-21 17:41 UTCEG score recompute
  30. 2026-08-20 22:55 UTCEPSS rescore
  31. 2026-08-20 15:38 UTCEG score recompute
  32. 2026-08-19 17:04 UTCEPSS rescore
  33. 2026-08-19 13:36 UTCEG score recompute
  34. 2026-08-18 13:48 UTCEPSS rescore
  35. 2026-08-18 11:33 UTCEG score recompute
  36. 2026-08-17 13:47 UTCEPSS rescore
  37. 2026-08-17 09:16 UTCEG score recompute
  38. 2026-08-16 14:56 UTCEPSS rescore
  39. 2026-08-16 07:14 UTCEG score recompute
  40. 2026-08-16 02:14 UTCEPSS rescore
  41. 2026-08-15 05:12 UTCEG score recompute
  42. 2026-08-15 01:30 UTCEPSS rescore
  43. 2026-08-14 03:09 UTCEG score recompute
  44. 2026-08-13 22:00 UTCEPSS rescore
  45. 2026-08-13 01:07 UTCEG score recompute
  46. 2026-08-12 13:51 UTCEPSS rescore
  47. 2026-08-11 23:05 UTCEG score recompute
  48. 2026-08-11 00:00 UTCEPSS rescore
  49. 2026-08-09 18:59 UTCEG score recompute
  50. 2026-08-09 13:46 UTCEPSS rescore
  51. 2026-08-08 16:57 UTCEG score recompute
  52. 2026-08-08 16:37 UTCEPSS rescore
  53. 2026-08-07 14:54 UTCEG score recompute
  54. 2026-08-06 13:47 UTCEPSS rescore
  55. 2026-08-06 12:52 UTCEG score recompute
  56. 2026-08-05 19:17 UTCEPSS rescore
  57. 2026-08-05 10:50 UTCEG score recompute
  58. 2026-08-04 15:10 UTCEPSS rescore
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  60. 2026-08-04 08:32 UTCEG score recompute
  61. 2026-08-03 10:36 UTCEPSS rescore
  62. 2026-08-02 03:52 UTCEG score recompute
  63. 2026-08-02 02:27 UTCEPSS rescore
  64. 2026-08-01 04:16 UTCEPSS rescore
  65. 2026-07-30 23:22 UTCEG score recompute
  66. 2026-07-30 16:28 UTCEPSS rescore
  67. 2026-07-30 01:30 UTCEPSS rescore
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  69. 2026-07-28 17:43 UTCEG score recompute
  70. 2026-07-28 15:37 UTCEPSS rescore
  71. 2026-07-27 15:39 UTCEG score recompute
  72. 2026-07-27 14:14 UTCEPSS rescore
  73. 2026-07-26 14:54 UTCEPSS rescore
  74. 2026-07-26 14:54 UTCEPSS rescore
  75. 2026-07-26 12:27 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-59895?
CVE-2026-59895 is a medium vulnerability published on July 8, 2026. Hono is a Web application framework that provides support for any JavaScript runtime. From 4.0.0 before 4.12.27, cx() in hono/css composes class names from plain strings but marks the result as already escaped without HTML-escaping the input, allowing untrusted className values used in a JSX class…
When was CVE-2026-59895 disclosed?
CVE-2026-59895 was first published on July 8, 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-2026-59895 actively exploited?
CVE-2026-59895 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (23rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59895?
CVE-2026-59895 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59895?
A fix for CVE-2026-59895 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59895 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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