CVE-2021-32671
published 2021-06-07CVE-2021-32671: Flarum is a forum software for building communities. Flarum's translation system allowed for string inputs to be converted into HTML DOM nodes when rendered…
PriorityP271critical10CVSS 3.1
AVNACLPRNUINSCCHIHAH
EPSS
39.74%
98.4th percentile
Flarum is a forum software for building communities. Flarum's translation system allowed for string inputs to be converted into HTML DOM nodes when rendered. This change was made after v0.1.0-beta.16 (our last beta before v1.0.0) and was not noticed or documented. This allowed for any user to type malicious HTML markup within certain user input fields and have this execute on client browsers. The example which led to the discovery of this vulnerability was in the forum search box. Entering faux-malicious HTML markup, such as alert('test') resulted in an alert box appearing on the forum. This attack could also be modified to perform AJAX requests on behalf of a user, possibly deleting discussions, modifying their settings or profile, or even modifying settings on the Admin panel if the attack was targetted towards a privileged user. All Flarum communities that run flarum v1.0.0 or v1.0.1 are impacted. The vulnerability has been fixed and published as flarum/core v1.0.2. All communities running Flarum v1.0 have to upgrade as soon as possible to v1.0.2.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| flarum | core | — | — |
| flarum | core | >= 1.0.0 < 1.0.2 | 1.0.2 |
| flarum | flarum | — | — |
| flarum | flarum | — | — |
CVSS provenance
nvdv3.110.0CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
nvdv2.04.3MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N
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GHSA
XSS vulnerability with translator
ghsa·2021-06-07
CVE-2021-32671 [CRITICAL] CWE-79 XSS vulnerability with translator
XSS vulnerability with translator
Flarum's translation system allowed for string inputs to be converted into HTML DOM nodes when rendered. This change was made after v0.1.0-beta.16 (our last beta before v1.0.0) and was not noticed or documented.
This allowed for any user to type malicious HTML markup within certain user input fields and have this execute on client browsers. The example which led to the discovery of this vulnerability was in the forum search box. Entering faux-malicious HTML markup, such as alert('test') resulted in an alert box appearing on the forum. This attack could also be modified to perform AJAX requests on behalf of a user, possibly deleting discussions, modifying their settings or profile, or even modifying settings on the Admin panel if the attack was targetted
OSV
XSS vulnerability with translator
osv·2021-06-07
CVE-2021-32671 [CRITICAL] XSS vulnerability with translator
XSS vulnerability with translator
Flarum's translation system allowed for string inputs to be converted into HTML DOM nodes when rendered. This change was made after v0.1.0-beta.16 (our last beta before v1.0.0) and was not noticed or documented.
This allowed for any user to type malicious HTML markup within certain user input fields and have this execute on client browsers. The example which led to the discovery of this vulnerability was in the forum search box. Entering faux-malicious HTML markup, such as alert('test') resulted in an alert box appearing on the forum. This attack could also be modified to perform AJAX requests on behalf of a user, possibly deleting discussions, modifying their settings or profile, or even modifying settings on the Admin panel if the attack was targetted
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/flarum/core/commit/440bed81b8019dff00642c8f493b4909d505a28ahttps://github.com/flarum/core/security/advisories/GHSA-5qjq-69w6-fg57https://packagist.org/packages/flarum/corehttps://github.com/flarum/core/commit/440bed81b8019dff00642c8f493b4909d505a28ahttps://github.com/flarum/core/security/advisories/GHSA-5qjq-69w6-fg57https://packagist.org/packages/flarum/core
2021-06-07
Published