CVE-2026-56709

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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

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
7.5HIGHmedium 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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

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 25, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Aug 25, 2026
🔬 Proof of concept available. No fix on record yet. 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
githubMentions a patch (unverified)🟡 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 23× in last 7d / 110× 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 177 total refreshes for this CVE.

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

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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 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 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56709?
CVE-2026-56709 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-2026-56709?
No fix for CVE-2026-56709 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-56709 are linked in the Vendor Advisories panel on this page.

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