CVE-2026-63408

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: 0.5% (40th 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content. Prior to 1.0.0-rc.16, the Grav API plugin JwtAuthenticator::extractBearerToken() accepts a JWT from the token URL query parameter on every /api/v1 route, including state-changing endpoints. Request URLs consequently expose valid access tokens through Apache, proxy, and CDN logs, browser history, and Referer headers, allowing a party with access to those records to reuse the token with the owner's API privileges. This issue is fixed in version 1.0.0-rc.16.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA 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%
Exploitation0% × 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
0.5%
EPSS %ILE
40th
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 none (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 19, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 19, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit.
github_release Patch Available

Release 1.0.0-rc.16 (getgrav/grav-plugin-api)

Patch available: getgrav/grav-plugin-api 1.0.0-rc.16 (pre-release)

https://github.com/getgrav/grav-plugin-api/releases/tag/1.0.0-rc.16
github_commit Patch Available

commit 56ae2ca3bf36 (getgrav/grav-plugin-api)

Patch available: getgrav/grav-plugin-api 1.0.0-rc.16 (contains commit 56ae2ca3bf36)

https://github.com/getgrav/grav-plugin-api/commit/56ae2ca3bf36c8299a4b3d376c6a20e8c0ed5ba9
githubMentions a patch (unverified)🟡 PoC Available

JWT Access Token Accepted via `?token=` URL Query Parameter · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-4hpj-wmpw-ghwq

Weakness Classification(1)

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

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Frequently asked(5)

What is CVE-2026-63408?
CVE-2026-63408 is a high vulnerability published on August 19, 2026. Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content. Prior to 1.0.0-rc.16, the Grav API plugin JwtAuthenticator::extractBearerToken() accepts a JWT from the token URL query parameter on every /api/v1 route, including state-changing endpoints.…
When was CVE-2026-63408 disclosed?
CVE-2026-63408 was first published on August 19, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63408 actively exploited?
CVE-2026-63408 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63408?
CVE-2026-63408 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-2026-63408?
A fix for CVE-2026-63408 is available: update to the fixed version the vendor names in its advisory.

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