CVE-2026-63490

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7% (51st 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
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Handlebars.java provides logic-less and semantic Mustache templates with Java. Prior to 4.5.3, com.github.jknack.handlebars.springmvc.SpringTemplateLoader resolves attacker-influenced Spring MVC view names through Spring ResourceLoader without the path-containment validation used by other URL-based loaders. In handlebars-springmvc/src/main/java/com/github/jknack/handlebars/springmvc/SpringTemplateLoader.java, a view name using a file: or classpath: URL and ending with the # fragment delimiter places the appended .hbs suffix in the fragment, which FileUrlResource.exists() and URL.openStream() discard. HandlebarsViewResolver in handlebars-springmvc/src/main/java/com/github/jknack/handlebars/springmvc/HandlebarsViewResolver.java then passes the attacker-controlled name to handlebars.compile(), allowing an unauthenticated remote attacker to read files accessible to the JVM when an application exposes a controller with a user-influenced view name. This issue is fixed in version 4.5.3.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100CISA 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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
51st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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

August 20, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Aug 20, 2026
Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

handlebars.java 4.5.3

Patch available: jknack/handlebars.java v4.5.3

https://github.com/jknack/handlebars.java/releases/tag/v4.5.3
github_commit Patch Available

commit 61f43423a337 (jknack/handlebars.java)

Patch available: jknack/handlebars.java v4.5.3 (contains commit 61f43423a337)

https://github.com/jknack/handlebars.java/commit/61f43423a337b87db5fec1fe59f0725aaaa38df5
githubMentions a patch (unverified)

Arbitrary file read in `SpringTemplateLoader` via URL-fragment suffix bypass · Advisory · jknack/handlebars.java · GitHub

https://github.com/jknack/handlebars.java/security/advisories/GHSA-g29j-rwfv-h99w

Vendor Advisories for CVE-2026-63490(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)
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
com.github.jknack:handlebars-springmvc0.10.0 ... 4.5.2 (56 versions)
  • every version up to 4.5.3: fixed in 4.5.3
—

Weakness Classification(3)

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

Data Freshness Timeline

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-63490?
CVE-2026-63490 is a high vulnerability published on August 20, 2026. Handlebars.java provides logic-less and semantic Mustache templates with Java. Prior to 4.5.3, com.github.jknack.handlebars.springmvc.SpringTemplateLoader resolves attacker-influenced Spring MVC view names through Spring ResourceLoader without the path-containment validation used by other URL-based…
When was CVE-2026-63490 disclosed?
CVE-2026-63490 was first published on August 20, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63490 actively exploited?
CVE-2026-63490 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63490?
CVE-2026-63490 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-63490?
A fix for CVE-2026-63490 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63490 are linked in the Vendor Advisories panel on this page.

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