CVE-2021-3818
Reliance on Cookies without Validation and Integrity Checking in getgrav/grav
grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Reliance on Cookies without Validation and Integrity Checking in getgrav/grav
grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking
- Record
CVE-2021-3818- CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-565
- Updated
- 2026-11-02
EUVDEUVD-2021-2039
grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking
- Record
EUVD-2021-2039- CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-cg3q-59w7-rvc2
Reliance on Cookies without Validation and Integrity Checking in getgrav/grav
grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking. A cookie with an overly broad path can be accessed through other applications on the same domain. Since cookies often carry sensitive information such as session identifiers, sharing cookies across applications can lead a vulnerability in one application to cause a compromise in another.
- Record
GHSA-cg3q-59w7-rvc2- CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-565
- Updated
- 2026-11-02
NVD
grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking
- Record
CVE-2021-3818- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Weakness
- CWE-565
- Updated
- 2026-11-02
OSV
grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking
- Record
CVE-2021-3818- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-cg3q-59w7-rvc2
Reliance on Cookies without Validation and Integrity Checking in getgrav/grav
grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking. A cookie with an overly broad path can be accessed through other applications on the same domain. Since cookies often carry sensitive information such as session identifiers, sharing cookies across applications can lead a vulnerability in one application to cause a compromise in another.
- Record
GHSA-cg3q-59w7-rvc2- CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-565
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
getgrav/gravPackagist | before 1.7.21 | 1.7.21 |
getgrav/gravPackagist | before 1.7.21, plus listed versions 0.8.00.9.00.9.10.9.100.9.11 Show 45 moreShow less0.9.120.9.130.9.140.9.150.9.160.9.170.9.180.9.190.9.20.9.200.9.210.9.220.9.230.9.240.9.250.9.260.9.270.9.280.9.290.9.30.9.300.9.310.9.320.9.330.9.340.9.350.9.360.9.370.9.380.9.390.9.40.9.400.9.410.9.420.9.430.9.440.9.450.9.50.9.60.9.70.9.80.9.91.0.01.0.0-rc.11.0.0-rc.2 | 1.7.21 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3818 is a medium vulnerability (CVSS 6.3) in Getgrav Getgrav/grav, published September 27, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.45%, the 84th percentile. Fixed in getgrav/grav 1.7.21.
References
Left out here: 188 versions. The JSON record has them.