CVE-2021-35478 Cross-site scripting in n/a
Reflected XSS in Nagios Log Server allows attackers to execute scripts via crafted links, potentially compromising user sessions.
- 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-2021-35478?
CVE-2021-35478 is a medium-severity cross-site scripting vulnerability in n/a, published on 27 Jul 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Nagios Log Server before 2.1.9 contains Reflected XSS in the dropdown box for the alert history and audit log function. All parameters used for filtering are affected. This affects users who open a crafted link or third-party web page.
Weakness: CWE-79
Which versions are affected by CVE-2021-35478?
It affects 1 product.
Products include Nagios Log Server.
How do I fix CVE-2021-35478?
No fix has been published for CVE-2021-35478 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-2021-35478 being exploited?
There is no known exploitation of CVE-2021-35478 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2025-44823 Information disclosure in Log Server
- CVE-2025-34277 Nagios Log Server < 2024R1.3.1 RCE via Malformed Dashboard ID
- CVE-2025-34274 Nagios Log Server < 2024R2.0.3 Logstash Process Root Privileges
- CVE-2023-7322 Nagios Log Server < 2024R1 Incorrect Authorization Granting Full API Access
- CVE-2025-34271 Nagios Log Server < 2024R2.0.2 Cluster Manager Credential Requests Sent Over Plaintext
Sources
Also known as GHSA-9q74-9jcx-243m.