CVE-2021-3904

Cross-site Scripting (XSS) - Stored in getgrav/grav

6.3 MediumFix available

grav is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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

0.59%Down 0.1 points since Oct 28, 2021

What each source reports

CVE List Score used 6.3

Cross-site Scripting (XSS) - Stored in getgrav/grav

grav is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Record: CVE-2021-3904
CVSS 3.0: 6.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2021-2302 6.3

grav is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Record: EUVD-2021-2302
CVSS 3.0: 6.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Updated: 2026-11-03

GitHub AdvisoriesGHSA-5jxc-hmqf-3f73 6.3

Cross-Site Scripting in grav

grav prior to version 1.7.24 is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').

Record: GHSA-5jxc-hmqf-3f73
CVSS 3.0: 6.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Weakness: CWE-79
Updated: 2026-11-02

NVD 5.4

grav is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Record: CVE-2021-3904
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 3.0: 6.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS 2.0: 3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 5.4

grav is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Record: CVE-2021-3904
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVGHSA-5jxc-hmqf-3f73 6.3

Cross-Site Scripting in grav

grav prior to version 1.7.24 is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').

Record: GHSA-5jxc-hmqf-3f73
CVSS 3.0: 6.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Weakness: CWE-79
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`getgrav/grav` Packagist	before 1.7.24	1.7.24
`getgrav/grav` Packagist	before 1.7.24, plus listed versions 0.8.00.9.00.9.10.9.100.9.11 Show 45 moreShow less 0.9.120.9.130.9.140.9.150.9.160.9.170.9.180.9.190.9.20.9.200.9.210.9.220.9.230.9.240.9.250.9.260.9.270.9.280.9.290.9.30.9.300.9.310.9.320.9.330.9.340.9.350.9.360.9.370.9.380.9.390.9.40.9.400.9.410.9.420.9.430.9.440.9.450.9.50.9.60.9.70.9.80.9.91.0.01.0.0-rc.11.0.0-rc.2	1.7.24

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-3904 is a medium vulnerability (CVSS 6.3) in Getgrav Getgrav/grav, published October 27, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.59%, the 48th percentile. Fixed in getgrav/grav 1.7.24.

References

This page doesn't list everything

Left out here: 191 versions. The JSON record has them.