Mozilla Focus vulnerabilities

16 CVEs affecting Mozilla Focus, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-11799, published 2026-06-09.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2023-29535, published 2023-06-02. Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days. Following a Garbage Collector compaction, weak maps may have been accessed before they were correctly traced. This resulted in memory corruption and a potentially exploitable crash. This…
CVE-2023-29541, published 2023-06-02. High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days. Firefox did not properly handle downloads of files ending in <code>.desktop</code>, which can be interpreted to run attacker-controlled commands. <br>*This bug only affects Firefox for Linux on…
CVE-2023-29539, published 2023-06-02. High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days. When handling the filename directive in the Content-Disposition header, the filename would be truncated if the filename contained a NULL character. This could have led to reflected file download…
CVE-2023-29550, published 2023-06-02. High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days. Memory safety bugs present in Firefox 111 and Firefox ESR 102.9. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited…
CVE-2023-29536, published 2023-06-02. High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days. An attacker could cause the memory manager to incorrectly free a pointer that addresses attacker-controlled memory, resulting in an assertion, memory corruption, or a potentially exploitable crash.…
CVE-2023-29548, published 2023-06-02. Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days. A wrong lowering instruction in the ARM64 Ion compiler resulted in a wrong optimization result. This vulnerability affects Firefox < 112, Focus for Android < 112, Firefox ESR < 102.10, Firefox for…
CVE-2023-29533, published 2023-06-02. Medium severity, CVSS 4.3. EPSS: 0.6% chance of exploitation in the next 30 days. A website could have obscured the fullscreen notification by using a combination of <code>window.open</code>, fullscreen requests, <code>window.name</code> assignments, and <code>setInterval</code>…
CVE-2023-29537, published 2023-06-02. High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days. Multiple race conditions in the font initialization could have led to memory corruption and execution of attacker-controlled code. This vulnerability affects Firefox for Android < 112, Firefox < 112,…
CVE-2023-29551, published 2023-06-02. High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days. Memory safety bugs present in Firefox 111. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary…
CVE-2023-29543, published 2023-06-02. High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days. An attacker could have caused memory corruption and a potentially exploitable use-after-free of a pointer in a global object's debugger vector. This vulnerability affects Firefox for Android < 112,…

Latest

CVE-2026-11799, published 2026-06-09. High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days. UXSS in Focus for iOS / Klar Webkit navigation. This vulnerability was fixed in Focus for iOS 151.3.1 and Klar for iOS 151.3.1.
CVE-2023-29549, published 2023-06-02. Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days. Under certain circumstances, a call to the <code>bind</code> function may have resulted in the incorrect realm. This may have created a vulnerability relating to JavaScript-implemented sandboxes such…
CVE-2023-29547, published 2023-06-02. Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days. When a secure cookie existed in the Firefox cookie jar an insecure cookie for the same domain could have been created, when it should have silently failed. This could have led to a desynchronization…
CVE-2023-29544, published 2023-06-02. Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days. If multiple instances of resource exhaustion occurred at the incorrect time, the garbage collector could have caused memory corruption and a potentially exploitable crash. This vulnerability affects…
CVE-2023-29540, published 2023-06-02. Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days. Using a redirect embedded into <code>sourceMappingUrls</code> could allow for navigation to external protocol links in sandboxed iframes without <code>allow-top-navigation-to-custom-protocols</code>.…