Mozilla has patched 10 vulnerabilities, half of them marked "critical," in its open-source browser as it updated Firefox to version 188.8.131.52.
The new Mozilla Messaging spin-off however, was not able to provide a matching update to its Thunderbird email client, which shares five of the Firefox flaws that were fixed.
Mozilla's six advisories spelled out five Firefox bugs marked "critical," three tagged "high" and one each "moderate" and "low."
"There's a little bit here to interest most everyone," said Andrew Storms, director of security operations at nCircle Network Security. "The bulletins claim no favour in the many types of vulnerabilities typically associated with browsers."
"Sun has updated the Java Runtime Environment with a fix for this problem. Mozilla has also added a fix to LiveConnect to protect users who don't have the latest version of Java," Mozilla said in the advisory.
"Here we have Firefox putting out a mitigation step for a bug in Java," said Storms. "It's a welcomed addition when one vendor can help out another."
All 10 vulnerabilities were also patched by the SeaMonkey project, a separate open-source initiative that develops a multi-function browser suite.
A release date for Thunderbird 184.108.40.206 to fix the flaws has not been set. According to David Ascher, the head of Mozilla Messaging, the emailer's update will follow Firefox's by "several weeks."
In a post to his blog last week, Ascher cited several reasons why a simultaneous release of Thunderbird and Firefox updates was impossible. "Some of those resource contentions are due to not enough automation for the Thunderbird release process, and some of it is the consequence of not enough people with the right training," he said.