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Fencer Vulns
medium 5.5

CVE-2020-29556 json

Grav CMS Local File Injection

published 2021-03-15 5 y ago modified 2026-06-17 4 mo ago also GHSA-r3rg-jrjq-w4mr , EUVD-2022-5083

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits
0
none known

Summary

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.)

Patch / fix

  • packagist getgrav/grav 1.6.30
  • getgrav grav_cms 1.7.0

Exploit prediction

0.98% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • blog.bssi.fr https://blog.bssi.fr/cve-2020-29553-cve-2020-29555-cve-2020-29556-multiple-vulnerabilities-within-cms-grav/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N
GitHub 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
packagist getgrav/grav
>=1.7.0-beta.1, <=1.7.0-rc.17
<1.6.30
1.6.30

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.