CVE-2026-58066

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-30. 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: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

Rocket.Chat's SAML SSO before versions 8.7.0, 8.6.1, 8.5.2, 8.4.5, 8.3.7, 8.2.7, 8.1.7, 8.0.8, and 7.10.14 verified XML signatures but did not bind the validated signature to samlp:Response / saml:Assertion. An attacker could submit a wrapped document carrying forged identity attributes alongside any valid signature made by the trusted IdP certificate, and log in as an arbitrary user.

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%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

July 30, 2026

Last Modified

August 25, 2026

Advisory Details (2)

Auto-updated Sep 9, 2026
Patch available. Sources: github_pr.
generic

HackerOne

https://hackerone.com/reports/3827674
github_pr Patch Available

fix: imported fixes 07-08-2026

Patch available: RocketChat/Rocket.Chat 8.7.0-rc.0 (PR #41233 merged 2026-07-08)

https://github.com/RocketChat/Rocket.Chat/pull/41233

Vendor Advisories for CVE-2026-58066(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 40× in last 7d / 175× 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 333 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-58066?
CVE-2026-58066 is a critical vulnerability published on July 30, 2026. Rocket.Chat's SAML SSO before versions 8.7.0, 8.6.1, 8.5.2, 8.4.5, 8.3.7, 8.2.7, 8.1.7, 8.0.8, and 7.10.14 verified XML signatures but did not bind the validated signature to samlp:Response / saml:Assertion. An attacker could submit a wrapped document carrying forged identity attributes alongside…
When was CVE-2026-58066 disclosed?
CVE-2026-58066 was first published in the National Vulnerability Database on July 30, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58066 actively exploited?
CVE-2026-58066 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 85.6% of all scored CVEs.
What is the CVSS score of CVE-2026-58066?
CVE-2026-58066 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-58066?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58066, 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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