CVE-2026-75827

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-18. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

Grav before 2.0.15 contains an arbitrary file write vulnerability in the Blueprint dynamic-data bare-function validation that uses an incomplete denylist instead of a positive allowlist. Attackers with page-edit or blueprint-config access can invoke the error_log function through a data directive to append PHP payloads to web-accessible files, achieving remote code execution.

CVSS v3
8.8
EG Score
8.8(high)
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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 19, 2026

Advisory Details (2)

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

Grav before 2.0.15 Arbitrary File Write via error_log | Advisories | VulnCheck

https://www.vulncheck.com/advisories/grav-before-arbitrary-file-write-via-error-log
github Patch Available

Blueprint dynamic-data bare-function branch is denylist-gated and omits error_log, giving arbitrary file write · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-f8wv-xp27-6gq7

Vendor Advisories for CVE-2026-75827(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 17× in last 7d / 17× 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.

  1. 2026-08-21 03:32 UTCEG score recompute
  2. 2026-08-21 03:32 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 15:30 UTCGHSA enrichment
  5. 2026-08-20 03:28 UTCEG score recompute
  6. 2026-08-20 03:28 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 15:25 UTCEG score recompute
  9. 2026-08-19 15:25 UTCGHSA enrichment
  10. 2026-08-19 14:27 UTCEG score recompute
  11. 2026-08-19 14:27 UTCGHSA enrichment
  12. 2026-08-19 12:39 UTCGHSA enrichment
  13. 2026-08-19 00:37 UTCGHSA enrichment
  14. 2026-08-18 12:35 UTCEG score recompute
  15. 2026-08-18 12:34 UTCGHSA enrichment
  16. 2026-08-18 11:29 UTCEG score recompute
  17. 2026-08-18 11:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-75827?
CVE-2026-75827 is a high vulnerability published on August 18, 2026. Grav before 2.0.15 contains an arbitrary file write vulnerability in the Blueprint dynamic-data bare-function validation that uses an incomplete denylist instead of a positive allowlist. Attackers with page-edit or blueprint-config access can invoke the error_log function through a data directive…
When was CVE-2026-75827 disclosed?
CVE-2026-75827 was first published in the National Vulnerability Database on August 18, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75827 actively exploited?
CVE-2026-75827 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.4% of all scored CVEs.
What is the CVSS score of CVE-2026-75827?
CVE-2026-75827 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-75827?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75827, 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

Explore the affected products and dependency analysis for CVE-2026-75827

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