CVE-2020-29556Public exploit

Arbitrary file disclosure via encoded backup path

Published Mar 15, 2021 · Updated Aug 4, 2024

Path traversal in Grav CMS through 1.7.0-rc.17 allows attackers to read arbitrary local files through crafted Backup download requests. Backups::getBackupDownloadUrl() base64-encodes the full attacker-controlled backup path instead of restricting it to a basename, allowing directory traversal when the download task resolves it. An authenticated session can invoke the task directly, while missing CSRF protection lets unauthenticated attackers trigger it through a logged-in user's browser.

CVSS severity5.5
Medium
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Grav CMS through 1.7.0-rc.17 allows attackers to read arbitrary local files through crafted Backup download requests. Backups::getBackupDownloadUrl() base64-encodes the full attacker-controlled backup path instead of restricting it to a basename, allowing directory traversal when the download task resolves it. An authenticated session can invoke the task directly, while missing CSRF protection lets unauthenticated attackers trigger it through a logged-in user's browser.

The record

CVE
CVE-2020-29556
Published
Mar 15, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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