CVE-2021-27839

Name: CVE-2021-27839
Creator: NVD / NIST
Published: 2021-03-03T19:15:13.047+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.4/10EPSS 0.72%

Last modified Jun 17, 2026

CVE-2021-27839 is a medium-severity vulnerability rated 4.4/10 on the CVSS scale. A CSV injection vulnerability found in Online Invoicing System (OIS) 4.3 and below can be exploited by users to perform malicious actions such as redirecting admins to unknown or harmful websites, or disclosing other clients' details that the user did not have access to.. EPSS estimates a 0.72% chance of exploitation in the next 30 days.

Description

A CSV injection vulnerability found in Online Invoicing System (OIS) 4.3 and below can be exploited by users to perform malicious actions such as redirecting admins to unknown or harmful websites, or disclosing other clients' details that the user did not have access to.

Metrics

CVSS 3.1

4.4/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS Probability

0.72%

49.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1236

Affected Software

Vendor	Product	Versions
Bigprof	Online Invoicing System	<= 4.3

References

https://github.com/bigprof-software/online-invoicing-system/releases/tag/4.4Release Notes, Third Party Advisory
https://www.jinsonvarghese.com/csv-injection-in-online-invoicing-system/Third Party Advisory
https://github.com/bigprof-software/online-invoicing-system/releases/tag/4.4Release Notes, Third Party Advisory
https://www.jinsonvarghese.com/csv-injection-in-online-invoicing-system/Third Party Advisory

Timeline

Published: Mar 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27839?

How severe is CVE-2021-27839?

CVE-2021-27839 has a CVSS score of 4.4/10 (MEDIUM severity). The EPSS model estimates a 0.72% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27839?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27839?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST