The phrase "a security warning" is correct and usable in written English.
It can be used when alerting someone about potential risks or issues related to security, often in the context of technology or safety.
Example: "When you log into the system, you may receive a security warning indicating that your password is weak."
Alternatives: "a safety alert" or "a risk notification."
Please be advised that in accessing this site you may encounter a security warning.
(A recent example of the latter was malware disguised as a security warning from Microsoft's digital crimes unit).
He was arrested, briefly held, and given a warning on his return, but his profile was not thought to justify further action beyond circulating a security warning.
Last week, the US government issued a security warning for Playa del Carmen, and temporarily closed its consulate after receiving information about a "security threat".
In a 12-page security bulletin on its Web site, Microsoft urged customers to be on the alert for programs that displayed a security warning on the user's screen asking if they wanted to install and run a particular program distributed by Microsoft and verified by VeriSign.
A security warning feedback message may help identify potential issues that may lead to the person being put at risk.
You may be presented with a Windows security warning.
My advice, as a behavioral psychologist, is that adding another few lines to your legal page or slapping on a data security warning pop-up about the risks of photo hacking won't work — just like it doesn't work for smoking, alcohol use or most other behaviors.
For example: When you download any app from Google's catalog (now, with 65,000 apps, about a third the size of Apple's), you get an alarming security warning.
Therefore it is possible that this profile could be an excessive security warning.
WASHINGTON — President Obama has taken the lead in a Democratic offensive on Social Security, warning that Republicans will revive efforts to privatize what is perhaps the government's most popular program if they seize control of Congress in the November elections.
