What’s Vulnerable › Vulnerabilities

CVE-2020-26163

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-09-30 · updated 2026-06-17

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.

Affected products

• bigbluebutton greenlight: before 2.5.6 — fixed in 2.5.6

How to fix

Upgrade to a fixed version: bigbluebutton greenlight 2.5.6. Check the vendor advisory for mitigations.

References

• https://github.com/bigbluebutton/greenlight/pull/1543
• https://github.com/bigbluebutton/greenlight/releases/tag/release-2.5.6
• https://www.sakshamanand.com/host-header-injection-bigbluebutton/
• https://github.com/bigbluebutton/greenlight/pull/1543
• https://github.com/bigbluebutton/greenlight/releases/tag/release-2.5.6
• https://www.sakshamanand.com/host-header-injection-bigbluebutton/

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