CVE-2020-29556

Exp

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.)

Published: 2021-03-15 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-29556 is rated Exploit Available (58/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.98%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-29556

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-29556

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.10% 0.98% +0.88%
2 2025-03-30 0.20% 0.10% -0.10%
3 2025-03-29 — 0.20% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-29556

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.8 3.6 [email protected]
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2020-29556

GitHub Security Advisory for CVE-2020-29556

GHSA-r3rg-jrjq-w4mr · Severity: medium · Ecosystem: composer — Grav CMS Local File Injection

Affected software / configurations for CVE-2020-29556

Vendor Product Version Raw CPE
getgrav grav_cms < 1.7.0 cpe:2.3:a:getgrav:grav_cms:*:*:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:beta1:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:beta10:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:beta2:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:beta3:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:beta4:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:beta5:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:beta6:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:beta7:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:beta8:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:beta9:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc1:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc10:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc11:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc12:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc13:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc14:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc15:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc16:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc17:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc2:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc20:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc3:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc4:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc5:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc6:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc7:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc8:*:*:*:*:*:*
getgrav grav_cms 1.7.0 cpe:2.3:a:getgrav:grav_cms:1.7.0:rc9:*:*:*:*:*:*

References for CVE-2020-29556

cvelogic Threat Intelligence