CVE-2021-27340 Cross-site scripting in n/a
Reflected XSS in OpenSIS allows attackers to execute arbitrary scripts via the opt parameter, potentially leading to session hijacking or data theft.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-27340?
CVE-2021-27340 is a medium-severity cross-site scripting vulnerability in Os4ed Opensis, published on 16 Sep 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
OpenSIS Community Edition version <= 7.6 is affected by a reflected XSS vulnerability in EmailCheck.php via the "opt" parameter.
Weakness: CWE-79
Which versions are affected by CVE-2021-27340?
It affects 1 product.
Products include Os4ed Opensis.
How do I fix CVE-2021-27340?
No fix has been published for CVE-2021-27340 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-2021-27340 being exploited?
There is no known exploitation of CVE-2021-27340 in the wild and no public exploit code.
Other vulnerabilities in Os4ed Opensis
Sources
Also known as GHSA-6ph7-3cx8-q7xh.