CVE-2021-4271 panicsteve w2wiki Markdown index.php toHTML cross site scripting
Remote attackers can execute arbitrary scripts in w2wiki via the Markdown handler, requiring a patch to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-4271?
CVE-2021-4271 is a low-severity cross-site scripting vulnerability in panicsteve w2wiki, published on 21 Dec 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A vulnerability was found in panicsteve w2wiki. It has been rated as problematic. Affected by this issue is the function toHTML of the file index.php of the component Markdown Handler. The manipulation leads to cross site scripting. The attack may be launched remotely. The name of the patch is 8f1d0470b4ddb1c7699e3308e765c11ed29542b6. It is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-216476.
Which versions are affected by CVE-2021-4271?
It affects 1 product.
Products include W2wiki Project W2wiki.
How do I fix CVE-2021-4271?
No fix has been published for CVE-2021-4271 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-4271 being exploited?
There is no known exploitation of CVE-2021-4271 in the wild and no public exploit code.
Sources
Also known as GHSA-q3hj-8gmm-3pv5.