CVE-2021-42940

CRITICALNVD 9.99.9—

9.9

A Cross Site Scripting (XSS) vulnerability exists in Projeqtor 9.3.1 via /projeqtor/tool/saveAttachment.php, which allows an attacker to upload a SVG file containing malicious JavaScript code.

CVSS v3: 9.9
EG Score: 9.9(medium)
EPSS: 65.7%
KEV: Not listed

Published

February 11, 2022

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated May 24, 2026

🔬 Proof of concept available. No patch confirmed yet.

generic

Free project management software

https://www.projeqtor.org/en/

generic🟡 PoC Available

Advisory Summary CVE-2021-42940 - CISO Global

https://truedigitalsecurity.com/services/penetration-testing-services/advisory-summary-2.2022-cve-2021-42940

Weakness Classification(1)

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

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-42940?

CVE-2021-42940 is a critical vulnerability published on February 11, 2022. A Cross Site Scripting (XSS) vulnerability exists in Projeqtor 9.3.1 via /projeqtor/tool/saveAttachment.php, which allows an attacker to upload a SVG file containing malicious JavaScript code.

When was CVE-2021-42940 disclosed?

CVE-2021-42940 was first published in the National Vulnerability Database on February 11, 2022, 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-2021-42940 actively exploited?

CVE-2021-42940 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 65.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-42940?

CVE-2021-42940 has a CVSS v3 base score of 9.9 (NVD).

How do I remediate CVE-2021-42940?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42940, 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

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CVE-2021-42940

📅 Published

🔄 Last Modified

📋 Advisory Details (2)