CVE-2015-8976

Name: CVE-2015-8976
Creator: NVD / NIST
Published: 2017-01-31T22:59:00.267+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.04%

Last modified Jun 17, 2026

CVE-2015-8976 is a vulnerability of currently unknown severity. 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.". EPSS estimates a 1.04% chance of exploitation in the next 30 days.

Description

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."

Metrics

EPSS Probability

1.04%

59.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Mybb	Merge System	1.8.5
Mybb	Mybb	<= 1.6.17
Mybb	Mybb	1.8.0
Mybb	Mybb	1.8.1
Mybb	Mybb	1.8.2
Mybb	Mybb	1.8.3
Mybb	Mybb	1.8.4
Mybb	Mybb	1.8.5

References

http://www.openwall.com/lists/oss-security/2016/11/10/8Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/11/18/1Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/94397
https://blog.mybb.com/2015/09/07/mybb-1-8-6-1-6-18-merge-system-1-8-6-release/Release Notes, Vendor Advisory
http://www.openwall.com/lists/oss-security/2016/11/10/8Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/11/18/1Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/94397
https://blog.mybb.com/2015/09/07/mybb-1-8-6-1-6-18-merge-system-1-8-6-release/Release Notes, Vendor Advisory

Timeline

Published: Jan 31, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-8976?

How severe is CVE-2015-8976?

Severity scoring for CVE-2015-8976 is pending analysis. The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2015-8976?

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-2015-8976?

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

Scan your code now

Source: NVD / NIST