CVE-2021-3977

MEDIUMNVD 5.45.4—

5.4

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

CVSS v3: 5.4
EG Score: 5.4(medium)
EPSS: 48.2%
KEV: Not listed

Published

December 24, 2021

Last Modified

November 21, 2024

References (4)

security@huntrhttps://github.com/invoiceninja/invoiceninja/commit/1186eaa82375692d01d5ef3369c5b7bc7315b55f
security@huntrhttps://huntr.dev/bounties/99c4ed09-b66f-474a-bd74-eeccf9339fde
af854a3a-2127-422b-91ae-364da2661108https://github.com/invoiceninja/invoiceninja/commit/1186eaa82375692d01d5ef3369c5b7bc7315b55f
af854a3a-2127-422b-91ae-364da2661108https://huntr.dev/bounties/99c4ed09-b66f-474a-bd74-eeccf9339fde

Affected Packages

(1 across 1 ecosystem)

Packagist(1)

Package	Vulnerable range	Fixed in	Dependents
hillelcoren/invoice-ninja	v1.0.2 ... v5.3.9 (372 versions)	5.3.35	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 05:49 UTCEG score recompute

Frequently asked(5)

What is CVE-2021-3977?

CVE-2021-3977 is a medium vulnerability published on December 24, 2021. invoiceninja is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

When was CVE-2021-3977 disclosed?

CVE-2021-3977 was first published in the National Vulnerability Database on December 24, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-3977 actively exploited?

CVE-2021-3977 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 48.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-3977?

CVE-2021-3977 has a CVSS v3 base score of 5.4 (NVD).

How do I remediate CVE-2021-3977?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3977, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-3977

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