CVE-2026-56709

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-25. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
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%CVSS: 7.5Exploit: None knownExposed: 0

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

Grav before 3.9.2 fails to validate untrusted Host headers in the sendInvitationEmail() function when constructing token-bearing invitation links. Attackers can manipulate the Host header to poison invitation links and redirect users to attacker-controlled domains, bypassing the require_trusted_host protection which only covers password reset flows.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Aug 25, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Grav before 3.9.2 Host Header Injection via sendInvitationEmail | Advisories | VulnCheck

https://www.vulncheck.com/advisories/grav-before-host-header-injection-via-sendinvitationemail
github Patch Available🟡 PoC Available

sendInvitationEmail() is missing the untrusted-Host-header protection the other three security-sensitive email links have, and require_trusted_host only enforces one of four flows · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-69vf-mjxw-x79j

Vendor Advisories for CVE-2026-56709(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 27× in last 7d / 104× 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 104 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-56709?
CVE-2026-56709 is a high vulnerability published on August 25, 2026. Grav before 3.9.2 fails to validate untrusted Host headers in the sendInvitationEmail() function when constructing token-bearing invitation links. Attackers can manipulate the Host header to poison invitation links and redirect users to attacker-controlled domains, bypassing the requiretrustedhost…
When was CVE-2026-56709 disclosed?
CVE-2026-56709 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56709 actively exploited?
CVE-2026-56709 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 82.4% of all scored CVEs.
What is the CVSS score of CVE-2026-56709?
CVE-2026-56709 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-56709?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56709, 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.

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