CVE-2020-26163

Name: CVE-2020-26163
Creator: NVD / NIST
Published: 2020-09-30T18:15:27.477+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.53%

Last modified Jun 17, 2026

CVE-2020-26163 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. BigBlueButton Greenlight before 2.5.6 allows HTTP header (Host and Origin) attacks, which can result in Account Takeover if a victim follows a spoofed password-reset link.. EPSS estimates a 1.53% chance of exploitation in the next 30 days.

Description

BigBlueButton Greenlight before 2.5.6 allows HTTP header (Host and Origin) attacks, which can result in Account Takeover if a victim follows a spoofed password-reset link.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.53%

71.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Bigbluebutton	Greenlight	< 2.5.6

References

https://github.com/bigbluebutton/greenlight/pull/1543Patch, Third Party Advisory
https://github.com/bigbluebutton/greenlight/releases/tag/release-2.5.6Third Party Advisory
https://www.sakshamanand.com/host-header-injection-bigbluebutton/Exploit, Third Party Advisory
https://github.com/bigbluebutton/greenlight/pull/1543Patch, Third Party Advisory
https://github.com/bigbluebutton/greenlight/releases/tag/release-2.5.6Third Party Advisory
https://www.sakshamanand.com/host-header-injection-bigbluebutton/Exploit, Third Party Advisory

Timeline

Published: Sep 30, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26163?

BigBlueButton Greenlight before 2.5.6 allows HTTP header (Host and Origin) attacks, which can result in Account Takeover if a victim follows a spoofed password-reset link.

How severe is CVE-2020-26163?

CVE-2020-26163 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.53% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26163?

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-2020-26163?

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

Scan your code now

Source: NVD / NIST