The vulnerability of Thunderbird email client, Firefox and Firefox ESR browsers, related to errors in processing the header of the isolated programming environment CSP without the “allow-scenarios” parameter, allows a hacker to circumvent the implemented CSP restrictions and execute any desired scenario.

The vulnerability of the Thunderbird email client, as well as browsers Firefox and Firefox ESR, is related to errors in processing the header of the isolated programming environment CSP, without the “allow-scenarios” parameter. Exploiting this vulnerability allows a remote attacker to circumvent...