CVE-2021-27889
MyBB Nested Auto URL XSS
Description
Cross-site Scripting (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages.
INFO
Published Date :
March 15, 2021, 5:15 p.m.
Last Modified :
Sept. 21, 2021, 5:48 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.7
Exploitability Score :
2.8
Public PoC/Exploit Available at Github
CVE-2021-27889 has a 3 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-27889.
| URL | Resource |
|---|---|
| http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html | Exploit Third Party Advisory VDB Entry |
| https://blog.sonarsource.com/mybb-remote-code-execution-chain | Exploit Third Party Advisory |
| https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm | Patch Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
安全类各家文库大乱斗
HTML CSS JavaScript Go Python Shell C
Mybb associate CVE-2021-27890 & CVE-2021-27889 to RCE poc
JavaScript Python
Some exploits I have written to showcase and to share
PHP Python C JavaScript
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-27889 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-27889 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Sep. 21, 2021
Action Type Old Value New Value Changed Reference Type https://blog.sonarsource.com/mybb-remote-code-execution-chain No Types Assigned https://blog.sonarsource.com/mybb-remote-code-execution-chain Exploit, Third Party Advisory -
CVE Modified by [email protected]
Aug. 20, 2021
Action Type Old Value New Value Added Reference https://blog.sonarsource.com/mybb-remote-code-execution-chain [No Types Assigned] -
Modified Analysis by [email protected]
Mar. 23, 2021
Action Type Old Value New Value Changed Reference Type http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html No Types Assigned http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html Exploit, Third Party Advisory, VDB Entry Changed Reference Type https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm Patch, Release Notes, Third Party Advisory https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm Patch, Third Party Advisory -
CVE Modified by [email protected]
Mar. 22, 2021
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html [No Types Assigned] -
Initial Analysis by [email protected]
Mar. 18, 2021
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Changed Reference Type https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm No Types Assigned https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm Patch, Release Notes, Third Party Advisory Added CWE NIST CWE-79 Added CPE Configuration OR *cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:* versions up to (excluding) 1.8.26 -
CVE Modified by [email protected]
Mar. 16, 2021
Action Type Old Value New Value Changed Description Cross-site Scriptiong (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages. Cross-site Scripting (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-27889 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-27889
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.40 }} 0.12%
score
0.73907
percentile