CVE-2026-61500

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-13. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

Rejetto HFS 3.0.0 through 3.2.0 derives its session-cookie signing key from the non-cryptographic Math.random() generator and discloses outputs of the same generator to unauthenticated clients during login. A remote attacker can collect a small number of login responses, reconstruct the generator's state, recover the signing key, and forge a valid administrator session cookie, leading to full administrative access and remote code execution via the server_code configuration feature.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
55%
KEV
Not listed

Published

July 13, 2026

Last Modified

July 15, 2026

Advisory Details (2)

Auto-updated Aug 29, 2026
Patch available. Sources: github_release.
generic

Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rejetto-hfs-session-forgery-via-predictable-signing-key
github_release Patch Available

3.2.1

Patch available: rejetto/hfs v3.2.1

https://github.com/rejetto/hfs/releases/tag/v3.2.1

Vendor Advisories for CVE-2026-61500(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 33× in last 7d / 215× 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 300 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-61500?
CVE-2026-61500 is a critical vulnerability published on July 13, 2026. Rejetto HFS 3.0.0 through 3.2.0 derives its session-cookie signing key from the non-cryptographic Math.random() generator and discloses outputs of the same generator to unauthenticated clients during login. A remote attacker can collect a small number of login responses, reconstruct the generator's…
When was CVE-2026-61500 disclosed?
CVE-2026-61500 was first published in the National Vulnerability Database on July 13, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-61500 actively exploited?
CVE-2026-61500 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 44.6% of all scored CVEs.
What is the CVSS score of CVE-2026-61500?
CVE-2026-61500 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-61500?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-61500, 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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