Grav: Admin Backup Zip File Exposes Account Credentials and Configuration Secrets

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-55885: 0.21% estimated exploitation activity in the next 30 days; percentile 12.00 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary An authenticated administrator with backup permissions can download a ZIP archive containing the full Grav installation root, including user/accounts/admin.yaml with the admin's bcrypt password hash and email, plus user/config/ with all site configuration. The download endpoint requires only the session-static admin-nonce in the URL, no additional form-level CSRF token, and reveals the server's full filesystem path in a Base64-encoded query parameter. Combined with the absence of login rate limiting on http://{GravURL}/admin, an attacker who obtains a single admin-nonce value (via Referrer leakage, browser history, or XSS) can exfiltrate password hashes for offline cracking and achieve account takeover. Details The vulnerability chain spans three components in the deployed Grav source tree at /var/www/html/grav/: 1. Backup archive scope — Backups::backup() /var/www/html/grav/system/src/Grav/Common/Backup/Backups.php:201-272 The backup() static method creates a ZIP of the…

Published by the source

18 Jun 2026, 14:31 UTC

Last modified by the source

18 Jun 2026, 14:31 UTC

Source last checked

26 Oct 2026, 14:49 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-2f86-9cp8-6hcf

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# Patch Next advisory brief: CVE-2026-55885

Advisory: Grav: Admin Backup Zip File Exposes Account Credentials and Configuration Secrets
IDs: CVE-2026-55885, GHSA-2f86-9cp8-6hcf
Record: https://patchnext.com/advisories/cve-2026-55885 (revision 1, source checked 26 Oct 2026, 14:49 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: getgrav/grav 1.7.53. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist getgrav/grav: affected < 1.7.53; fixed in 1.7.53

## Suggested inspection (read-only)
- Packagist getgrav/grav: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on getgrav/grav.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-2f86-9cp8-6hcf (GitHub-reviewed advisory GHSA-2f86-9cp8-6hcf lists affected ranges: Packagist getgrav/grav >=0 <1.7.53)

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