CVE-2026-9733

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-23. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

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

Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter.

When no state generator is specified in the constructor, the module defaults to using a SHA-1 hash of predictable and low-entropy sources, including the epoch time (which is leaked via the HTTP Date header) and a call to Perl's built-in rand function.

A predictable state allows an attacker to hijack another user's session through cross site request forgery (CSRF).

CVSS v3
9.1
EG Score
9.1(high)
EPSS
26.3%
KEV
Not listed

Published

June 23, 2026

Last Modified

June 23, 2026

Advisory Details (4)

Auto-updated Jun 23, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-9733: Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter

http://www.openwall.com/lists/oss-security/2026/06/23/1
generic
https://security.metacpan.org/patches/M/Mojolicious-Plugin-Web-Auth/0.17/CVE-2026-9733-r2.patch
generic

lib/Mojolicious/Plugin/Web/Auth/OAuth2.pm - metacpan.org

https://metacpan.org/release/HAYAJO/Mojolicious-Plugin-Web-Auth-0.17/source/lib/Mojolicious/Plugin/Web/Auth/OAuth2.pm#L129-131
generic

RFC 6749 - The OAuth 2.0 Authorization Framework

https://datatracker.ietf.org/doc/html/rfc6749#section-10.12

Vendor Advisories for CVE-2026-9733(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 152× 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 152 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-9733?
CVE-2026-9733 is a critical vulnerability published on June 23, 2026. Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter. When no state generator is specified in the constructor, the module defaults to using a SHA-1 hash of predictable and low-entropy sources, including the epoch time (which is leaked via…
When was CVE-2026-9733 disclosed?
CVE-2026-9733 was first published in the National Vulnerability Database on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9733 actively exploited?
CVE-2026-9733 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 26.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9733?
CVE-2026-9733 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-9733?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9733, 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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