CVE-2021-3977

Cross-site Scripting (XSS) - Stored in invoiceninja/invoiceninja

6.5 MediumFix available

invoiceninja 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: High
Integrity: None
Availability: None

Exploit likelihood

0.61%Down 0.1 points since Dec 25, 2021

What each source reports

CVE List Score used 6.5

Cross-site Scripting (XSS) - Stored in invoiceninja/invoiceninja

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

Record: CVE-2021-3977
CVSS 3.0: 6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2022-0741 6.5

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

Record: EUVD-2022-0741
CVSS 3.0: 6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-xg6r-5gx4-qxjm 5.4

invoiceninja is vulnerable to Cross-site Scripting

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

Record: GHSA-xg6r-5gx4-qxjm
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

NVD 5.4

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

Record: CVE-2021-3977
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: 6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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

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

Record: CVE-2021-3977
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-xg6r-5gx4-qxjm 5.4

invoiceninja is vulnerable to Cross-site Scripting

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

Record: GHSA-xg6r-5gx4-qxjm
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`hillelcoren/invoice-ninja` Packagist	before 5.3.35	5.3.35
`hillelcoren/invoice-ninja` Packagist	before 5.3.35, plus listed versions v1.0.2v1.0.3v1.1.0v1.1.1v1.1.2 Show 45 moreShow less v1.2.0v1.2.1v1.2.2v1.3.0v1.3.1v1.3.2v1.3.3v1.4.0v1.5.0v1.5.1v1.5.2v1.6.0v1.6.1v1.7.0v1.7.1v1.7.2v2.0.0v2.0.0_RC1v2.0.1v2.1.0v2.1.1v2.1.2v2.2.0v2.2.1v2.2.2v2.3.0v2.3.1v2.3.2v2.3.3v2.3.4v2.4.0v2.4.1v2.4.2v2.4.3v2.4.4v2.4.5v2.4.6v2.4.7v2.4.8v2.4.8.1v2.4.9v2.4.9.1v2.4.9.2v2.4.9.3v2.4.9.4	5.3.35

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-2021-3977 is a medium vulnerability (CVSS 6.5) in Invoiceninja Invoiceninja/invoiceninja, published December 24, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.61%, the 49th percentile. Fixed in hillelcoren/invoice-ninja 5.3.35.

References

This page doesn't list everything

Left out here: 322 versions. The JSON record has them.