Vulnerability report

Trusted Third Party Report High Confidence Not in CISA KEV

CVE-2026-42608

grav Path Traversal

Getgrav / grav · affected before 2.0.0-beta.2

Watch CVE-2026-42608 Browse KEV feed
Severity
CVSS 8.8 · High
Confidence
High
Exploit status
Trusted Third Party Report
EPSS
0.6%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-42608 is an unauthenticated vulnerability affecting Getgrav grav. Grav is a file-based Web platform. Prior to 2.0.0-beta.2, there is a Path Traversal vulnerability within the FormFlash core component.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Also reported by third-party sources. Confidence is high.

Who is affected?

Getgrav / grav affected before 2.0.0-beta.2.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Grav is a file-based Web platform

Grav is a file-based Web platform. Prior to 2.0.0-beta.2, there is a Path Traversal vulnerability within the FormFlash core component. By manipulating the session_id (passed as __form-flash-id in POST requests), an unauthenticated attacker can traverse the filesystem to create arbitrary directories and write an index.yaml file containing attacker-controlled data.

This vulnerability can lead to unauthorized modification of application behavior, potential data integrity issues, and service disruption in production environments. This vulnerability is fixed in 2.0.0-beta.2.

getgrav Affected
grav
Before 2.0.0-beta.2
Published
11 May 2026
Exploitation Attempts Reported
27 Sep 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

CVE References

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

BleepingComputer

Recorded 27 Sep 2026

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
BleepingComputer First 2026-09-27 17:12 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

8.8 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

EPSS

0.6%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') CWE-22

Recent mention · SOCRadar

September 2026: FBI Breach, Clop Hijack & IDScan Leak

The major cyber attacks of September 2026 hit federal law enforcement, a rival cybercrime gang, and the companies that verify identities. ShinyHunters hijacked the Clop ransomware gang’s Dark Web leak site and, four days later, claimed a breach of the Federal Bureau of...

Read full advisory

All CVSS Scores

CVSS v4.0 8.8 High

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

CVSS v3.1 9.1 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

All Mentions

Recent mention · SOCRadar

September 2026: FBI Breach, Clop Hijack & IDScan Leak

SOCRadar · 27 Oct 2026

The major cyber attacks of September 2026 hit federal law enforcement, a rival cybercrime gang, and the companies that verify identities. ShinyHunters hijacked the Clop ransomware gang’s Dark Web leak site and, four days later, claimed a breach of the Federal Bureau of Investigation (FBI). Identity data drove the month’s biggest numbers, led by adata […]

Timeline

From disclosure to observed exploitation attempts

  1. 17:12 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party report of exploitation attempts

  2. 15:02 UTC

    CVE published

    Vulnerability disclosed publicly

  3. 00:31 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-42608

Sample API response 
{
  "cve_id": "CVE-2026-42608",
  "confidence": "High",
  "cvss_score": 8.8,
  "cvss_estimated": false,
  "epss_score": 0.00603,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}