CVE-2021-3818

Name: CVE-2021-3818
Creator: NVD / NIST
Published: 2021-09-27T13:15:07.777+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 2.37%

Last modified Jun 17, 2026

CVE-2021-3818 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking. EPSS estimates a 2.37% chance of exploitation in the next 30 days.

Description

grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

2.37%

81.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Getgrav	Grav	< 1.7.22

References

https://github.com/getgrav/grav/commit/c51fb1779b83f620c0b6f3548d4a96322b55df07Third Party Advisory
https://huntr.dev/bounties/c2bc65af-7b93-4020-886e-8cdaeb0a58eaExploit, Patch, Third Party Advisory
https://github.com/getgrav/grav/commit/c51fb1779b83f620c0b6f3548d4a96322b55df07Third Party Advisory
https://huntr.dev/bounties/c2bc65af-7b93-4020-886e-8cdaeb0a58eaExploit, Patch, Third Party Advisory

Timeline

Published: Sep 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3818?

grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking

How severe is CVE-2021-3818?

CVE-2021-3818 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 2.37% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3818?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3818?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST