CVE-2021-21260

Name: CVE-2021-21260
Creator: NVD / NIST
Published: 2021-01-22T18:15:12.61+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.60%

Last modified Jun 17, 2026

CVE-2021-21260 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Online Invoicing System (OIS) is open source software which is a lean invoicing system for small businesses, consultants and freelancers created using AppGini. In OIS version 4.0 there is a stored XSS which can enables an attacker takeover of the admin account through a payload that extracts a csrf token and sends a request to change password. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

Description

Online Invoicing System (OIS) is open source software which is a lean invoicing system for small businesses, consultants and freelancers created using AppGini. In OIS version 4.0 there is a stored XSS which can enables an attacker takeover of the admin account through a payload that extracts a csrf token and sends a request to change password. It has been found that Item description is reflected without sanitization in app/items_view.php which enables the malicious scenario.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.60%

44.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Bigprof	Online Invoicing System	4.0

References

https://github.com/bigprof-software/online-invoicing-system/releases/tag/4.2Third Party Advisory
https://github.com/bigprof-software/online-invoicing-system/security/advisories/GHSA-rm79-5596-r7q4Exploit, Third Party Advisory
https://github.com/bigprof-software/online-invoicing-system/releases/tag/4.2Third Party Advisory
https://github.com/bigprof-software/online-invoicing-system/security/advisories/GHSA-rm79-5596-r7q4Exploit, Third Party Advisory

Timeline

Published: Jan 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21260?

How severe is CVE-2021-21260?

CVE-2021-21260 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21260?

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-2021-21260?

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

Scan your code now

Source: NVD / NIST