CVE-2021-26929 Cross-site scripting in n/a
Attackers can execute arbitrary JavaScript via crafted plain text emails in Horde Groupware Webmail, 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
- Available
What is CVE-2021-26929?
CVE-2021-26929 is a medium-severity cross-site scripting vulnerability in Debian Debian Linux, published on 14 Feb 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
An XSS issue was discovered in Horde Groupware Webmail Edition through 5.2.22 (where the Horde_Text_Filter library before 2.3.7 is used). The attacker can send a plain text e-mail message, with JavaScript encoded as a link or email that is mishandled by preProcess in Text2html.php, because bespoke use of \x00\x00\x00 and \x01\x01\x01 interferes with XSS defenses.
Weakness: CWE-79
Which versions are affected by CVE-2021-26929?
It affects 2 products.
Products include Debian Debian Linux, Horde Groupware.
How do I fix CVE-2021-26929?
Upgrade to a fixed version.
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-2021-26929 being exploited?
There is no known exploitation of CVE-2021-26929 in the wild and no public exploit code.
Public exploit code: 1 Exploit-DB entry.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2021-26929, DLA-2564-1, GHSA-qc5g-54hm-vfmc, UBUNTU-CVE-2021-26929.