CVE-2026-53424

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 72% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

Authentication Bypass by Capture-replay vulnerability in dropbox samly allows an attacker to authenticate as the subject of a captured SAML assertion by resubmitting it.

Samly.Helper.decode_idp_auth_resp/3 in lib/samly/helper.ex calls esaml_sp:validate_assertion/2, whose default duplicate detector is a no-op. The /3 arity accepting a DuplicateFun exists in esaml and implements the check, but Samly never calls it and offers no configuration to supply one, so the SAML 2.0 Web Browser SSO Profile requirement that a bearer assertion be used once is unenforced. An attacker holding a valid SAMLResponse obtained from the network, from browser history, or from logs can submit the identical bytes repeatedly until the assertion's NotOnOrAfter passes, each time establishing a session as the assertion's subject.

This issue affects samly: from 0.3.0 onward.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

August 20, 2026

Last Modified

August 24, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
No patch confirmed yet.
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/EEF-CVE-2026-53424
generic

CVE-2026-53424

https://cna.erlef.org/cves/CVE-2026-53424.html

Vendor Advisories for CVE-2026-53424(1)

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

Affected Packages

(1 across 1 ecosystem)
Hex(1)
PackageVulnerable rangeFixed inDependents
samly0.10.0 ... 1.4.0 (27 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 49× in last 7d / 216× 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 216 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-53424?
CVE-2026-53424 is a critical vulnerability published on August 20, 2026. Authentication Bypass by Capture-replay vulnerability in dropbox samly allows an attacker to authenticate as the subject of a captured SAML assertion by resubmitting it. Samly.Helper.decodeidpauthresp/3 in lib/samly/helper.ex calls esamlsp:validate_assertion/2, whose default duplicate detector is a…
When was CVE-2026-53424 disclosed?
CVE-2026-53424 was first published in the National Vulnerability Database on August 20, 2026, with the most recent update on August 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53424 actively exploited?
CVE-2026-53424 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 72.0% of all scored CVEs.
What is the CVSS score of CVE-2026-53424?
CVE-2026-53424 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-53424?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53424, 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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