CVE-2026-73683

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. A secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 8.1Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Laravel Socialite's Facebook provider contains an authentication bypass vulnerability that allows unauthenticated attackers to replay captured OIDC id_tokens by exploiting the missing nonce claim validation in the getUserByOIDCToken() function within FacebookProvider.php. Attackers who obtain a valid, unexpired id_token issued for the same Facebook App ID can submit the captured token to the backend userFromToken() endpoint, bypassing authentication controls because signature, aud, and iss checks pass while no session-bound nonce comparison is performed, resulting in unauthorized access to victim accounts.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100CISA 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
Severity81% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.8%
EPSS %ILE
53rd
KEV
Not listed

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

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 14, 2026

Last Modified

September 24, 2026

Advisory Details (4)

Auto-updated Aug 14, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic

Laravel Socialite Facebook Provider Authentication Bypass via Nonce Replay | Advisories | VulnCheck

https://www.vulncheck.com/advisories/laravel-socialite-facebook-provider-authentication-bypass-via-nonce-replay
generic

GitHub - laravel/socialite: Laravel wrapper around OAuth 1 & OAuth 2 libraries. · GitHub

https://github.com/laravel/socialite
github_commit

commit caf714f55d51 (laravel/socialite)

Fix landed in laravel/socialite commit caf714f55d51 — awaiting tagged release

https://github.com/laravel/socialite/commit/caf714f55d51ab0d914b40033d8b0f489d6219cc
github_pr

fix: Validate Facebook OIDC token nonce

Fix merged in laravel/socialite PR #789 on 2026-08-13 — awaiting tagged release

https://github.com/laravel/socialite/pull/789

Vendor Advisories for CVE-2026-73683(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 18× in last 7d / 95× 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 185 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-73683?
CVE-2026-73683 is a high vulnerability published on August 14, 2026. Laravel Socialite's Facebook provider contains an authentication bypass vulnerability that allows unauthenticated attackers to replay captured OIDC idtokens by exploiting the missing nonce claim validation in the getUserByOIDCToken() function within FacebookProvider.php. Attackers who obtain a…
When was CVE-2026-73683 disclosed?
CVE-2026-73683 was first published on August 14, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73683 actively exploited?
CVE-2026-73683 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73683?
CVE-2026-73683 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73683?
An upstream fix for CVE-2026-73683 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-73683 are linked in the Vendor Advisories panel on this page.

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