CVE-2026-75833

MEDIUMPre-NVD 4.24.2—
EchelonGraph scoreMEDIUM confidence

Score 4.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-18. A secondary CVSS source baseline 4.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 4.2Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

The Grav API plugin (getgrav/grav-plugin-api, bundled with Grav 2.0's admin-next/API stack) before version 1.0.14 contains an open redirect weakness in SsoController::sanitizeReturnTo(). The function rejects a literal '//' prefix but does not account for browsers normalizing backslashes to slashes in special (http/https) schemes, so a returnTo value such as '/\evil.com' passes the guard and is later resolved by the browser as the protocol-relative URL '//evil.com'. Following a legitimate OAuth login flow, an attacker-supplied returnTo parameter could redirect an authenticated victim to an attacker-controlled site for post-login phishing. Full browser-side exploitability depends on the admin-next SPA's client-side oauth-callback handler and was not independently verified by the reporter.

CVSS v3
4.2
EG Score
4.2MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100CISA 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
Severity42% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (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 18, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Aug 18, 2026
Patch available. Sources: github.
generic

Grav API Plugin Open Redirect via Backslash Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/grav-api-plugin-open-redirect-via-backslash-bypass
github Patch Available

SsoController::sanitizeReturnTo() backslash bypass of the in-app-path-only open-redirect guard · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-x72c-4jc4-8rh6

Vendor Advisories for CVE-2026-75833(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 13× in last 7d / 69× 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 119 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-75833?
CVE-2026-75833 is a medium vulnerability published on August 18, 2026. The Grav API plugin (getgrav/grav-plugin-api, bundled with Grav 2.0's admin-next/API stack) before version 1.0.14 contains an open redirect weakness in SsoController::sanitizeReturnTo(). The function rejects a literal '//' prefix but does not account for browsers normalizing backslashes to slashes…
When was CVE-2026-75833 disclosed?
CVE-2026-75833 was first published on August 18, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75833 actively exploited?
CVE-2026-75833 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-75833?
CVE-2026-75833 has a CVSS base score of 4.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-75833?
A fix for CVE-2026-75833 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-75833 are linked in the Vendor Advisories panel on this page.

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