CVE-2026-42844

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 75% 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, nvd
Elevated
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

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

Grav is a file-based Web platform. In Grav 2.0.0-beta.2, a low-privileged authenticated API user with api.media.write can abuse /api/v1/blueprint-upload to write an arbitrary YAML file into user/accounts/, then log in as the newly created account with api.super privileges. This results in full administrative compromise of the Grav API. This vulnerability is fixed in API 1.0.0-beta.17.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
25.6%
KEV
Not listed

Published

May 12, 2026

Last Modified

May 19, 2026

Advisory Details (1)

Auto-updated May 12, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Low-privileged API users can create super-admin accounts via blueprint-upload · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-6xx2-m8wv-756h

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
getgrav/grav0.8.0 ... 2.0.0-beta.3 (319 versions)2.0.0-beta.4—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 48× 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 106 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:16 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
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  15. 2026-06-28 12:55 UTCEG score recompute
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  1. 2026-06-22 14:25 UTCEPSS rescore
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  3. 2026-06-21 14:56 UTCEPSS rescore
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  10. 2026-06-17 14:57 UTCEG score recompute
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  22. 2026-06-12 14:49 UTCEG score recompute
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  24. 2026-06-11 14:00 UTCEPSS rescore
  25. 2026-06-11 13:58 UTCEG score recompute
  26. 2026-06-11 01:35 UTCEG score recompute
  27. 2026-06-10 22:18 UTCEPSS rescore
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  30. 2026-06-10 13:12 UTCEG score recompute
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  34. 2026-06-08 14:17 UTCEPSS rescore
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  37. 2026-06-07 23:16 UTCEG score recompute
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  40. 2026-06-07 10:53 UTCEG score recompute
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  42. 2026-06-06 13:47 UTCEPSS rescore
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  44. 2026-06-06 10:07 UTCEG score recompute
  45. 2026-06-05 22:47 UTCEPSS rescore
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  51. 2026-06-04 13:12 UTCEPSS rescore
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  53. 2026-06-04 08:35 UTCEG score recompute
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  60. 2026-06-01 13:52 UTCEPSS rescore
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  63. 2026-05-31 22:30 UTCEPSS rescore
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  73. 2026-05-26 13:44 UTCEPSS rescore
  74. 2026-05-26 07:18 UTCEPSS rescore
  75. 2026-05-26 07:18 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-42844?
CVE-2026-42844 is a high vulnerability published on May 12, 2026. Grav is a file-based Web platform. In Grav 2.0.0-beta.2, a low-privileged authenticated API user with api.media.write can abuse /api/v1/blueprint-upload to write an arbitrary YAML file into user/accounts/, then log in as the newly created account with api.super privileges. This results in full…
When was CVE-2026-42844 disclosed?
CVE-2026-42844 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42844 actively exploited?
CVE-2026-42844 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 25.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42844?
CVE-2026-42844 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-42844?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42844, 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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