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CVE Record

CVE-2020-26163: BigBlueButton Greenlight before 2.5.6 allows HTTP header (Host and Origin) attacks, which can result in Acc...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

BigBlueButton Greenlight before 2.5.6 could trust attacker-controlled Host or Origin headers when creating password-reset links. A victim who follows a spoofed reset link could have their account taken over. The available sources do not show active exploitation or provide CVSS scoring.

Executive priority

Prioritize remediation where Greenlight is internet-facing or used by privileged meeting administrators. Treat as urgent if versions before 2.5.6 remain deployed, because successful abuse can lead to account takeover.

Technical view

CVE-2020-26163 is an HTTP Host/Origin header trust issue in BigBlueButton Greenlight before 2.5.6. The reported impact is account takeover through spoofed password-reset links. Public references point to the 2.5.6 release and a related Greenlight pull request as the vendor-side correction path.

Likely exposure

Exposure is most likely for organizations running BigBlueButton Greenlight versions earlier than 2.5.6, especially internet-accessible deployments with password-reset functionality enabled.

Exploitation context

The documented scenario requires a victim to follow a spoofed password-reset link. The bundle does not cite CISA KEV listing, active exploitation, exploit code, or mass scanning evidence.

Researcher notes

Evidence is narrow but consistent: the CVE description, external write-up, release tag, and pull request all center on Host/Origin header handling in Greenlight password reset behavior. No CVSS, CWE, KEV, or exploitation telemetry is provided in the bundle.

Mitigation direction

  • Upgrade BigBlueButton Greenlight to 2.5.6 or later.
  • Review the Greenlight 2.5.6 release notes and related pull request.
  • Check vendor guidance for supported configuration hardening.
  • Review password-reset branding and domain controls for user confusion risks.

Validation and detection

  • Inventory all BigBlueButton Greenlight deployments and record versions.
  • Confirm no production instance runs a version earlier than 2.5.6.
  • Review logs for unusual Host or Origin values around password resets.
  • Verify password-reset links use the organization’s expected canonical domain.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2020-26163 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.