A security issue has been reported in mod_ssl, which potentially can be exploited by malicious people to bypass certain security restrictions.
The security issue is caused due to an error in enforcing client-based certificate authentication ("SSLVerifyClient require") in per-location context, if "SSLVerifyClient optional" was configured in the global virtual host configuration. This may allow malicious people to bypass client-based certificate authentication and gain unauthorised access to certain web pages.
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