CVE-2015-8976: n/a vulnerability

CVE-2015-8976: Cross-site scripting (XSS) vulnerability in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6...

Cross-site scripting (XSS) vulnerability in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB Merge System before 1.8.6 might allow remote attackers to inject arbitrary web script or HTML via vectors related to "old upgrade files."

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 08:36 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2015-8976 is a cross-site scripting issue in older MyBB forum software and the MyBB Merge System. A remote attacker could inject script or HTML through old upgrade-file related paths. This can affect user trust and administrator sessions, but the sources do not show active exploitation. Exposure is most likely on public MyBB forums running versions before 1.6.18 or 1.8.6, or Merge System before 1.8.6, especially where old upgrade files remain reachable from the web. Treat this as a timely hygiene fix for legacy forum deployments, not an emergency absent evidence of exploitation. Public-facing forums with administrators using the same interface deserve priority because XSS can support account abuse and reputational harm. Mitigation focus: Upgrade MyBB to 1.6.18, 1.8.6, or later supported releases.; Upgrade MyBB Merge System to 1.8.6 or later if present.; Review MyBB vendor guidance for handling old upgrade files..

Prepared: Jun 13, 2026, 06:20 UTC (UTC+00:00)

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

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jan 31, 2017, 22:00 UTC (UTC+00:00)

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

2Source links

CVSS and timeline data

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

Source materials

CVE List V5 sourceCVE List V5
https://blog.mybb.com/2015/09/07/mybb-1-8-6-1-6-18-merge-system-1-8-6-release/CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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