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CVE Record

CVE-2020-29556: The Backup functionality in Grav CMS through 1.7.0-rc.17 allows an authenticated attacker to read arbitrary...

The Backup functionality in Grav CMS through 1.7.0-rc.17 allows an authenticated attacker to read arbitrary local files on the underlying server by exploiting a path-traversal technique. (This vulnerability can also be exploited by an unauthenticated attacker due to a lack of CSRF protection.)

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Grav CMS backup functionality through 1.7.0-rc.17 can be abused to read local files from the server. The CVE says authenticated attackers can use path traversal, and missing CSRF protection may enable unauthenticated exploitation. Business risk is exposure of configuration files, secrets, or other sensitive server data.

Executive priority

Treat as high priority where Grav CMS is internet-facing or stores secrets on the web server. The absence of CVSS and patch details limits precision, but arbitrary local file read can expose credentials and enable follow-on compromise.

Technical view

CVE-2020-29556 is an arbitrary local file read in Grav CMS backup functionality through 1.7.0-rc.17. The vulnerability is described as path traversal, with a CSRF weakness expanding possible access conditions. The source bundle provides no CVSS score, CWE mapping, CPE list, patch version, or detailed fix instructions.

Likely exposure

Organizations are likely exposed if they run Grav CMS through 1.7.0-rc.17 and have the backup functionality reachable by users or administrators. Exposure is less clear where backup access is tightly restricted or CSRF protections are independently enforced.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation evidence. The CVE states authenticated exploitation is possible, and unauthenticated exploitation may be possible because of missing CSRF protection. No exploit code or weaponized campaign evidence is included.

Researcher notes

The strongest source facts are the affected Grav version range, backup-function path traversal, arbitrary local file read, and missing CSRF protection. Evidence is incomplete for scoring, exact fixed version, exploit maturity, and affected CPEs, so validation should rely on vendor guidance and local testing.

Mitigation direction

  • Check official Grav CMS guidance for the fixed version or advisory details.
  • Upgrade Grav CMS if vendor guidance identifies a fixed release.
  • Restrict access to administrative and backup functionality to trusted users only.
  • Review CSRF protections around administrative backup actions.
  • Monitor for unexpected backup activity or suspicious local file access.

Validation and detection

  • Inventory Grav CMS instances and record running versions.
  • Confirm whether any instance is through 1.7.0-rc.17.
  • Review who can access backup functionality on affected instances.
  • Check whether backup actions enforce CSRF protection.
  • Look for evidence of sensitive local files in generated backups or logs.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2020-29556 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.