CVE-2026-63687

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-06. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Apache CXF's JwtRequestCodeFilter copies all claims from a signed request JWT into the authorization parameter map without excluding security-sensitive parameters. A client that can produce a validly-signed request JWT (e.g., one whose client_secret is known or compromised) can thereby substitute the code_challenge, code_challenge_method, nonce, and state values that were set in the outer HTTP request, undermining PKCE integrity and OpenID Connect replay protection. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100CISA 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
Severity91% × 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
0.3%
EPSS %ILE
18th
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 total (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 6, 2026

Last Modified

August 7, 2026

Advisory Details (2)

Auto-updated Sep 16, 2026
Patch available.
generic

oss-security - CVE-2026-63687: Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters

http://www.openwall.com/lists/oss-security/2026/08/06/22
generic
https://lists.apache.org/thread/drcq4chmt0btx86f17o47j17r378hzpw

Vendor Advisories for CVE-2026-63687(2)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatcxf-rt-rs-security-oauth22026-09-24redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 38× in last 7d / 165× 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 397 total refreshes for this CVE.

  1. 2026-10-04 23:27 UTCEG score recompute
  2. 2026-10-04 23:27 UTCVendor advisory
  3. 2026-10-04 23:27 UTCGHSA enrichment
  4. 2026-10-04 23:22 UTCEPSS rescore
  5. 2026-10-04 13:25 UTCVendor advisory
  6. 2026-10-04 13:25 UTCGHSA enrichment
  7. 2026-10-04 09:37 UTCVendor advisory
  8. 2026-10-04 09:37 UTCGHSA enrichment
  9. 2026-10-04 05:54 UTCEG score recompute
  10. 2026-10-04 05:54 UTCVendor advisory
  11. 2026-10-04 05:54 UTCGHSA enrichment
  12. 2026-10-03 14:26 UTCEPSS rescore
  13. 2026-10-03 01:06 UTCEG score recompute
  14. 2026-10-03 01:06 UTCVendor advisory
  15. 2026-10-03 01:06 UTCGHSA enrichment
  16. 2026-10-02 17:56 UTCEPSS rescore
  17. 2026-10-02 16:44 UTCVendor advisory
  18. 2026-10-02 16:44 UTCGHSA enrichment
  19. 2026-10-02 09:46 UTCEG score recompute
  20. 2026-10-02 09:46 UTCVendor advisory
  21. 2026-10-02 09:46 UTCGHSA enrichment
  22. 2026-10-01 19:50 UTCEPSS rescore
  23. 2026-10-01 13:55 UTCVendor advisory
  24. 2026-10-01 13:55 UTCGHSA enrichment
  25. 2026-10-01 10:12 UTCVendor advisory
Show 75 more
  1. 2026-10-01 10:12 UTCGHSA enrichment
  2. 2026-10-01 05:58 UTCVendor advisory
  3. 2026-10-01 05:58 UTCGHSA enrichment
  4. 2026-10-01 01:48 UTCEG score recompute
  5. 2026-10-01 01:48 UTCVendor advisory
  6. 2026-10-01 01:48 UTCGHSA enrichment
  7. 2026-09-30 15:03 UTCEPSS rescore
  8. 2026-09-29 06:01 UTCEG score recompute
  9. 2026-09-29 06:01 UTCVendor advisory
  10. 2026-09-29 06:01 UTCGHSA enrichment
  11. 2026-09-28 13:51 UTCEPSS rescore
  12. 2026-09-28 13:37 UTCVendor advisory
  13. 2026-09-28 13:37 UTCGHSA enrichment
  14. 2026-09-28 09:55 UTCVendor advisory
  15. 2026-09-28 09:55 UTCGHSA enrichment
  16. 2026-09-28 06:13 UTCVendor advisory
  17. 2026-09-28 06:13 UTCGHSA enrichment
  18. 2026-09-28 02:31 UTCVendor advisory
  19. 2026-09-28 02:31 UTCGHSA enrichment
  20. 2026-09-27 17:35 UTCEG score recompute
  21. 2026-09-27 17:35 UTCVendor advisory
  22. 2026-09-27 17:35 UTCGHSA enrichment
  23. 2026-09-26 15:59 UTCEPSS rescore
  24. 2026-09-25 08:52 UTCGHSA enrichment
  25. 2026-09-25 04:27 UTCEG score recompute
  26. 2026-09-25 04:27 UTCGHSA enrichment
  27. 2026-09-24 12:08 UTCGHSA enrichment
  28. 2026-09-24 08:26 UTCGHSA enrichment
  29. 2026-09-24 04:44 UTCGHSA enrichment
  30. 2026-09-24 01:02 UTCGHSA enrichment
  31. 2026-09-23 21:19 UTCEG score recompute
  32. 2026-09-23 21:19 UTCGHSA enrichment
  33. 2026-09-23 17:54 UTCEPSS rescore
  34. 2026-09-23 14:05 UTCGHSA enrichment
  35. 2026-09-23 08:38 UTCGHSA enrichment
  36. 2026-09-23 04:56 UTCGHSA enrichment
  37. 2026-09-23 01:14 UTCGHSA enrichment
  38. 2026-09-22 21:21 UTCEG score recompute
  39. 2026-09-22 21:21 UTCGHSA enrichment
  40. 2026-09-22 12:55 UTCGHSA enrichment
  41. 2026-09-22 08:48 UTCGHSA enrichment
  42. 2026-09-22 05:01 UTCGHSA enrichment
  43. 2026-09-22 01:17 UTCEG score recompute
  44. 2026-09-22 01:17 UTCGHSA enrichment
  45. 2026-09-21 12:57 UTCGHSA enrichment
  46. 2026-09-20 20:44 UTCEG score recompute
  47. 2026-09-20 20:43 UTCGHSA enrichment
  48. 2026-09-20 20:16 UTCEPSS rescore
  49. 2026-09-20 10:59 UTCGHSA enrichment
  50. 2026-09-20 05:12 UTCGHSA enrichment
  51. 2026-09-20 01:16 UTCGHSA enrichment
  52. 2026-09-19 21:34 UTCGHSA enrichment
  53. 2026-09-19 17:37 UTCEG score recompute
  54. 2026-09-19 17:37 UTCGHSA enrichment
  55. 2026-09-19 13:11 UTCGHSA enrichment
  56. 2026-09-19 07:31 UTCGHSA enrichment
  57. 2026-09-19 03:15 UTCGHSA enrichment
  58. 2026-09-18 22:17 UTCEG score recompute
  59. 2026-09-18 22:17 UTCGHSA enrichment
  60. 2026-09-18 19:28 UTCEPSS rescore
  61. 2026-09-18 17:37 UTCGHSA enrichment
  62. 2026-09-18 13:13 UTCGHSA enrichment
  63. 2026-09-18 08:31 UTCGHSA enrichment
  64. 2026-09-18 04:40 UTCGHSA enrichment
  65. 2026-09-18 00:58 UTCEG score recompute
  66. 2026-09-18 00:58 UTCGHSA enrichment
  67. 2026-09-17 15:17 UTCGHSA enrichment
  68. 2026-09-17 08:43 UTCGHSA enrichment
  69. 2026-09-17 04:44 UTCGHSA enrichment
  70. 2026-09-17 01:02 UTCEG score recompute
  71. 2026-09-17 01:02 UTCGHSA enrichment
  72. 2026-09-16 14:08 UTCEPSS rescore
  73. 2026-09-16 11:12 UTCGHSA enrichment
  74. 2026-09-16 06:49 UTCEG score recompute
  75. 2026-09-16 06:49 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2026-63687?
CVE-2026-63687 is a critical vulnerability published on August 6, 2026. Apache CXF's JwtRequestCodeFilter copies all claims from a signed request JWT into the authorization parameter map without excluding security-sensitive parameters. A client that can produce a validly-signed request JWT (e.g., one whose clientsecret is known or compromised) can thereby substitute…
When was CVE-2026-63687 disclosed?
CVE-2026-63687 was first published on August 6, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63687 actively exploited?
CVE-2026-63687 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63687?
CVE-2026-63687 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-63687?
A fix for CVE-2026-63687 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63687 are linked in the Vendor Advisories panel on this page.

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