CVE-2020-18661

Name: CVE-2020-18661
Creator: NVD / NIST
Published: 2021-06-24T15:15:08.113+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.14%

Last modified Jun 17, 2026

CVE-2020-18661 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Cross Site Scripting (XSS) vulnerability in gnuboard5 <=v5.3.2.8 via the url parameter to bbs/login.php.. EPSS estimates a 1.14% chance of exploitation in the next 30 days.

Description

Cross Site Scripting (XSS) vulnerability in gnuboard5 <=v5.3.2.8 via the url parameter to bbs/login.php.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

1.14%

62.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Sir	Gnuboard	<= 5.3.2.8

References

https://github.com/LoRexxar/CVE_Request/tree/master/gnuboard5%20mul%20vuls%20before%20v5.3.2.8#limited-reflective-xss-in-bbsloginphpThird Party Advisory
https://github.com/gnuboard/gnuboard5/issues/43Exploit, Third Party Advisory
https://www.seebug.org/vuldb/ssvid-97925Third Party Advisory
https://github.com/LoRexxar/CVE_Request/tree/master/gnuboard5%20mul%20vuls%20before%20v5.3.2.8#limited-reflective-xss-in-bbsloginphpThird Party Advisory
https://github.com/gnuboard/gnuboard5/issues/43Exploit, Third Party Advisory
https://www.seebug.org/vuldb/ssvid-97925Third Party Advisory

Timeline

Published: Jun 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-18661?

Cross Site Scripting (XSS) vulnerability in gnuboard5 <=v5.3.2.8 via the url parameter to bbs/login.php.

How severe is CVE-2020-18661?

CVE-2020-18661 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.14% probability of exploitation in the next 30 days.

How do I fix CVE-2020-18661?

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-2020-18661?

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

Scan your code now

Source: NVD / NIST