PT-2021-17648 · Mybb · Mybb

Dvz · Published 2021-03-15 · Updated 2024-03-06 · CVE-2021-27889

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions: MyBB versions prior to 1.8.26

Description: The issue is related to a Cross-site Scripting (XSS) vulnerability. It occurs when parsing messages, specifically via Nested Auto URL. This vulnerability can be exploited to execute malicious scripts on the client-side.

Recommendations: For versions prior to 1.8.26, update to version 1.8.26 or later to resolve the issue.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BIT-MYBB-2021-27889

CVE-2021-27889

GHSA-XHJ7-3349-MQCM

Affected Products

Mybb

References · 13

• 🔥 http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html · Exploit
• 🔥 https://blog.sonarsource.com/mybb-remote-code-execution-chain · Exploit
• 🔥 https://exploit-db.com/exploits/49696 · Exploit
• https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm · Patch
• https://osv.dev/vulnerability/BIT-mybb-2021-27889 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-27889 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-27889 · Security Note
• https://t.me/rnetsec/14626 · Telegram Post
• https://t.me/cibsecurity/24904 · Telegram Post
• https://t.me/defcon_news/71713 · Telegram Post
• https://t.me/cvenotify/11446 · Telegram Post
• https://t.me/cvenotify/11715 · Telegram Post
• https://t.me/cybersecuritytechnologies/2955 · Telegram Post