CVE-2020-26211
BookStack Cross-Site Scripting (XSS) and Meta Tag Injection Vulnerability
Description
In BookStack before version 0.30.4, a user with permissions to edit a page could insert JavaScript code through the use of `javascript:` URIs within a link or form which would run, within the context of the current page, when clicked or submitted. Additionally, a user with permissions to edit a page could insert a particular meta tag which could be used to silently redirect users to a alternative location upon visit of a page. Dangerous content may remain in the database but will be removed before being displayed on a page. If you think this could have been exploited the linked advisory provides a SQL query to test. As a workaround without upgrading, page edit permissions could be limited to only those that are trusted until you can upgrade although this will not address existing exploitation of this vulnerability. The issue is fixed in BookStack version 0.30.4.
INFO
Published Date :
Nov. 3, 2020, 9:15 p.m.
Last Modified :
Nov. 16, 2020, 4:07 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.8
Exploitability Score :
2.3
Public PoC/Exploit Available at Github
CVE-2020-26211 has a 1 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-2020-26211.
| URL | Resource |
|---|---|
| https://github.com/BookStackApp/BookStack/commit/bbd1384acbe7e52c21f89af69f2dc391c95dbf54 | Patch Third Party Advisory |
| https://github.com/BookStackApp/BookStack/releases/tag/v0.30.4 | Release Notes Third Party Advisory |
| https://github.com/BookStackApp/BookStack/security/advisories/GHSA-r2cf-8778-3jgp | Third Party Advisory |
| https://www.bookstackapp.com/blog/beta-release-v0-30-4/ | Patch Vendor 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).
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2020-26211 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-26211 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 -
Initial Analysis by [email protected]
Nov. 16, 2020
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:S/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N Changed Reference Type https://github.com/BookStackApp/BookStack/commit/bbd1384acbe7e52c21f89af69f2dc391c95dbf54 No Types Assigned https://github.com/BookStackApp/BookStack/commit/bbd1384acbe7e52c21f89af69f2dc391c95dbf54 Patch, Third Party Advisory Changed Reference Type https://github.com/BookStackApp/BookStack/releases/tag/v0.30.4 No Types Assigned https://github.com/BookStackApp/BookStack/releases/tag/v0.30.4 Release Notes, Third Party Advisory Changed Reference Type https://github.com/BookStackApp/BookStack/security/advisories/GHSA-r2cf-8778-3jgp No Types Assigned https://github.com/BookStackApp/BookStack/security/advisories/GHSA-r2cf-8778-3jgp Third Party Advisory Changed Reference Type https://www.bookstackapp.com/blog/beta-release-v0-30-4/ No Types Assigned https://www.bookstackapp.com/blog/beta-release-v0-30-4/ Patch, Vendor Advisory Added CPE Configuration OR *cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:* versions up to (excluding) 0.30.4 -
CVE Modified by [email protected]
Nov. 03, 2020
Action Type Old Value New Value Changed Description In BookStack before version 0.30.4, a user with permissions to edit a page could insert JavaScript code through the use of `javascript:` URIs within a link or form which would run, within the context of the current page, when clicked or submitted. Additionally, a user with permissions to edit a page could insert a particular meta tag which could be used to silently redirect users to a alternative location upon visit of a page. Dangerous content may remain in the database but will be removed before being displayed on a page. If you think this could have been exploited the linked advisory provides a SQL query to test. As a workaround without upgrading, page edit permissions could be limited to only those that are trusted until you can upgrade although this will not address existing exploitation of this vulnerability. The issue is fixed in BookStack version 0.30.4. In BookStack before version 0.30.4, a user with permissions to edit a page could insert JavaScript code through the use of `javascript:` URIs within a link or form which would run, within the context of the current page, when clicked or submitted. Additionally, a user with permissions to edit a page could insert a particular meta tag which could be used to silently redirect users to a alternative location upon visit of a page. Dangerous content may remain in the database but will be removed before being displayed on a page. If you think this could have been exploited the linked advisory provides a SQL query to test. As a workaround without upgrading, page edit permissions could be limited to only those that are trusted until you can upgrade although this will not address existing exploitation of this vulnerability. The issue is fixed in BookStack version 0.30.4.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-26211 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-2020-26211
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.09 }} 0.00%
score
0.37822
percentile