CVE-2026-21826

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2026-06-05. a secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

HCL Digital Experience and HCL Digital Experience Compose could be susceptible to Host header injection.  An attacker can manipulate the Host header and cause the application to behave in unexpected ways.

CVSS v3
6.1
EG Score
6.1(medium)
EPSS
4.0%
KEV
Not listed

Published

June 5, 2026

Last Modified

June 10, 2026

Advisory Details (1)

Auto-updated Jun 16, 2026
No patch confirmed yet.
generic

Security Bulletin: HCL Digital Experience and Digital Experience Compose may be affected by multiple vulnerabilities - Customer Support

https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0130849

Vendor Advisories for CVE-2026-21826(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 90× 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. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 02:23 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 18:48 UTCEG score recompute
  6. 2026-07-05 18:48 UTCGHSA enrichment
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-04 06:31 UTCEPSS rescore
  10. 2026-07-04 00:22 UTCEG score recompute
  11. 2026-07-04 00:22 UTCGHSA enrichment
  12. 2026-07-02 22:24 UTCEG score recompute
  13. 2026-07-02 22:24 UTCGHSA enrichment
  14. 2026-07-01 20:16 UTCEG score recompute
  15. 2026-07-01 20:16 UTCGHSA enrichment
  16. 2026-07-01 15:06 UTCEPSS rescore
  17. 2026-07-01 15:06 UTCEPSS rescore
  18. 2026-06-30 23:22 UTCEPSS rescore
  19. 2026-06-30 18:16 UTCEG score recompute
  20. 2026-06-30 18:16 UTCGHSA enrichment
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-29 10:51 UTCEG score recompute
  23. 2026-06-29 10:51 UTCGHSA enrichment
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 08:53 UTCEG score recompute
Show 72 more
  1. 2026-06-28 08:53 UTCGHSA enrichment
  2. 2026-06-28 04:56 UTCEPSS rescore
  3. 2026-06-28 04:56 UTCEPSS rescore
  4. 2026-06-27 06:56 UTCEG score recompute
  5. 2026-06-27 06:56 UTCGHSA enrichment
  6. 2026-06-27 03:08 UTCEPSS rescore
  7. 2026-06-26 04:58 UTCEG score recompute
  8. 2026-06-26 04:58 UTCGHSA enrichment
  9. 2026-06-25 13:49 UTCEPSS rescore
  10. 2026-06-25 03:00 UTCEG score recompute
  11. 2026-06-25 03:00 UTCGHSA enrichment
  12. 2026-06-24 14:05 UTCEPSS rescore
  13. 2026-06-24 01:02 UTCEG score recompute
  14. 2026-06-24 01:01 UTCGHSA enrichment
  15. 2026-06-23 21:32 UTCEPSS rescore
  16. 2026-06-22 23:03 UTCEG score recompute
  17. 2026-06-22 23:03 UTCGHSA enrichment
  18. 2026-06-22 14:25 UTCEPSS rescore
  19. 2026-06-22 14:25 UTCEPSS rescore
  20. 2026-06-21 14:56 UTCEPSS rescore
  21. 2026-06-21 14:56 UTCEPSS rescore
  22. 2026-06-21 01:59 UTCEPSS rescore
  23. 2026-06-21 01:59 UTCEPSS rescore
  24. 2026-06-20 14:26 UTCEG score recompute
  25. 2026-06-20 14:26 UTCGHSA enrichment
  26. 2026-06-19 19:25 UTCEPSS rescore
  27. 2026-06-19 12:18 UTCEG score recompute
  28. 2026-06-19 12:17 UTCGHSA enrichment
  29. 2026-06-18 17:52 UTCEPSS rescore
  30. 2026-06-18 07:28 UTCEG score recompute
  31. 2026-06-18 07:28 UTCGHSA enrichment
  32. 2026-06-17 17:53 UTCEPSS rescore
  33. 2026-06-17 04:13 UTCEG score recompute
  34. 2026-06-17 04:12 UTCGHSA enrichment
  35. 2026-06-16 17:52 UTCEPSS rescore
  36. 2026-06-16 02:14 UTCEG score recompute
  37. 2026-06-16 02:14 UTCGHSA enrichment
  38. 2026-06-15 17:48 UTCEPSS rescore
  39. 2026-06-15 00:16 UTCEG score recompute
  40. 2026-06-15 00:16 UTCGHSA enrichment
  41. 2026-06-14 23:18 UTCEPSS rescore
  42. 2026-06-13 23:00 UTCEPSS rescore
  43. 2026-06-13 23:00 UTCEPSS rescore
  44. 2026-06-13 22:18 UTCEG score recompute
  45. 2026-06-13 22:18 UTCGHSA enrichment
  46. 2026-06-12 23:12 UTCEPSS rescore
  47. 2026-06-12 20:18 UTCEG score recompute
  48. 2026-06-12 20:18 UTCGHSA enrichment
  49. 2026-06-11 18:20 UTCEG score recompute
  50. 2026-06-11 18:20 UTCGHSA enrichment
  51. 2026-06-11 14:00 UTCEPSS rescore
  52. 2026-06-10 22:18 UTCEPSS rescore
  53. 2026-06-10 16:21 UTCEG score recompute
  54. 2026-06-10 16:21 UTCGHSA enrichment
  55. 2026-06-10 13:22 UTCEPSS rescore
  56. 2026-06-09 14:24 UTCEG score recompute
  57. 2026-06-09 14:24 UTCGHSA enrichment
  58. 2026-06-08 14:17 UTCEPSS rescore
  59. 2026-06-08 14:17 UTCEPSS rescore
  60. 2026-06-08 12:26 UTCEG score recompute
  61. 2026-06-08 12:26 UTCGHSA enrichment
  62. 2026-06-07 15:25 UTCEPSS rescore
  63. 2026-06-07 15:24 UTCEPSS rescore
  64. 2026-06-07 10:28 UTCEG score recompute
  65. 2026-06-07 10:28 UTCGHSA enrichment
  66. 2026-06-06 13:47 UTCEPSS rescore
  67. 2026-06-06 13:47 UTCEPSS rescore
  68. 2026-06-06 13:47 UTCEPSS rescore
  69. 2026-06-06 08:31 UTCEG score recompute
  70. 2026-06-06 08:31 UTCGHSA enrichment
  71. 2026-06-05 22:47 UTCEPSS rescore
  72. 2026-06-05 06:33 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-21826?
CVE-2026-21826 is a medium vulnerability published on June 5, 2026. HCL Digital Experience and HCL Digital Experience Compose could be susceptible to Host header injection. An attacker can manipulate the Host header and cause the application to behave in unexpected ways.
When was CVE-2026-21826 disclosed?
CVE-2026-21826 was first published in the National Vulnerability Database on June 5, 2026, with the most recent update on June 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21826 actively exploited?
CVE-2026-21826 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-21826?
CVE-2026-21826 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-21826?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21826, 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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