CVE-2021-3818 json
Reliance on Cookies without Validation and Integrity Checking in getgrav/grav
published 2021-09-27 5 y ago modified 2026-06-17 4 mo ago also GHSA-cg3q-59w7-rvc2 , EUVD-2021-2039
- cvss
- 6.3
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.5%
- EPSS 2.5% chance of exploitation in 30 days, percentile 84%
- public exploits
- 0
- none known
Summary
grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking
Patch / fix
- packagist getgrav/grav 1.7.21
- getgrav getgrav/grav 1.7.22
Exploit prediction
2.45% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- huntr.dev https://huntr.dev/bounties/c2bc65af-7b93-4020-886e-8cdaeb0a58ea referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 6.3 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
| GitHub | 3.0 | 6.3 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | getgrav/grav | <1.7.21 |
1.7.21 |
Affected products
- getgrav getgrav/grav
Classification
- Weakness
-
- CWE-565 Reliance on Cookies without Validation and Integrity Checking
References
-
github.com
/getgrav/grav/commit/c51fb1779b83f620c0b6f3548d4a96322b55df07
web, third-party-advisory
-
huntr.dev
/bounties/c2bc65af-7b93-4020-886e-8cdaeb0a58ea
web, exploit, patch, third-party-advisory
-
github.com
/getgrav/grav
package
Sources
- CVE List CVE-2021-3818
- GitHub Advisory GHSA-cg3q-59w7-rvc2
- NVD CVE-2021-3818
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.