{"id":"CVE-2026-54521","summary":"FairEmail: Cross-site scripting (XSS) in AMP message rendering (ActivityAMP)","details":"FairEmail is a fully featured, open source, privacy-friendly email app for Android. Prior to 1.2319, the ActivityAMP AMP message renderer in app/src/main/java/eu/faircode/email/ActivityAMP.java enables JavaScript in its WebView but incompletely sanitizes untrusted message HTML. For non-allowlisted hosts, script.removeAttr(\"src\") leaves inline script elements in the document and does not reject event-handler attributes or javascript: URLs on other elements. A crafted AMP email can execute arbitrary JavaScript when a recipient opens the message and enables the AMP toggle. The script can read the message DOM, exfiltrate message data, and display phishing overlays within the message-body area. Exploitation requires the recipient to enable the AMP toggle, and practical exposure is reduced because AMP email is uncommon. This issue is fixed in version 1.2319.","aliases":["GHSA-r8ff-qr7g-pvw6"],"modified":"2026-09-20T14:24:14.157020Z","published":"2026-09-17T20:17:47.341Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54521.json"},"references":[{"type":"WEB","url":"https://github.com/M66B/FairEmail/releases/tag/1.2319"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54521.json"},{"type":"ADVISORY","url":"https://github.com/M66B/FairEmail/security/advisories/GHSA-r8ff-qr7g-pvw6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54521"},{"type":"FIX","url":"https://github.com/M66B/FairEmail/commit/fb37bbfabf5e75d08f0cfa6ce9b84469d62a20a0"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/m66b/fairemail","events":[{"introduced":"0"},{"fixed":"fb37bbfabf5e75d08f0cfa6ce9b84469d62a20a0"},{"fixed":"0b0fe9ac1cee98620f16aef85cebf67869ca41a8"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.2319"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["1.2318","1.2317","1.2316","1.2315","1.2314","1.2313","1.2312","1.2311","1.2310","1.2309","1.2308","1.2307","1.2306","1.2305","1.2304","1.2303","1.2302","1.2301","1.2300","1.2299","1.2298","1.2297","1.2296","1.2295","1.2294","1.2293","1.2292","1.2291","1.2290","1.2289","1.2288","1.2287","1.2286","1.2285","1.2284","1.2283","1.2282","1.2281","1.2280","1.2279","1.2278","1.2277","1.2276","1.2275","1.2274","1.2273","1.2272","1.2271","1.2270","1.2269","1.2268","1.2267","1.2266","1.2265","1.2264","1.2263","1.2262","1.2261","1.2260","1.2259","1.2258","1.2257","1.2256","1.2254","1.2253","1.2252","1.2251","1.2250","1.2249","1.2248","1.2247","1.2246","1.2245","1.2244","1.2243","1.2242","1.2241","1.2240","1.2239","1.2238","1.2237","1.2236","1.2235","1.2234","1.2233","1.2232","1.2231","1.2230","1.2229","1.2228","1.2227","1.2226","1.2225","1.2224","1.2223","1.2222","1.2221","1.2220","1.2219","1.2218","1.2217","1.2216","1.2215","1.2214","1.2213","1.2212","1.2211","1.2210","1.2209","1.2208","1.2207","1.2206","1.2205","1.2204","1.2203","1.2202","1.2201","1.2200","1.2199","1.2198","1.2197","1.2196","1.2195","1.2194","1.2193","1.2192","1.2191","1.2190","1.2189","1.2188","1.2187","1.2186","1.2185","1.2184","1.2183","1.2182","1.2181","1.2180","1.2179","1.2178","1.2177","1.2176","1.2175","1.2174","1.2173","1.2172","1.2171","1.2170","1.2169","1.2168","1.2167","1.2166","1.2165","1.2164","1.2163","1.2162","1.2161","1.2160","1.2159","1.2158","1.2157","1.2156","1.2155","1.2154","1.2153","1.2152","1.2151","1.2150","1.2149","1.2145","1.2144","1.2143","1.2142","1.2141","1.2140","1.2139","1.2138","1.2137","1.2136","1.2135","1.2134","1.2133","1.2132","1.2131","1.2130","1.2129","1.2112","1.2111","1.2110","1.2109","1.2108","1.2107","1.2106","1.2105","1.2104","1.2103","1.2102","1.2101","1.2100","1.2099","1.2098","1.2097","1.2096","1.2095","1.2093","1.2092","1.2091","1.2090","1.2089","1.2088","1.2087","1.2086","1.2085","1.2083","1.2082","1.2081","1.2080","1.2079","1.2078","1.2077","1.2076","1.2075","1.2074","1.2073","1.2072","1.2071","1.2070","1.2069","1.2068","1.2067","1.2066","1.2065","1.2064","1.2063","1.2062","1.2061","1.2060","1.2058","1.2057","1.2056","1.2055","1.2054","1.2053","1.2052","1.2051","1.2050","1.2049","1.2048","1.2047","1.2046","1.2045","1.2043","1.2042","1.2041","1.2040","1.2039","1.2038","1.2037","1.2036","1.2035","1.2034","1.2033","1.2032","1.2031","1.2030","1.2029","1.2028","1.2027","1.2026","1.2025","1.2024","1.2023","1.2022","1.2021","1.2020","1.2019","1.2018","1.2017","1.2016","1.2015","1.2014","1.2013","1.2012","1.2011","1.2010b","1.2010","1.2009","1.2008b","1.2008","1.2007c","1.2007b","1.2007","1.2006","1.2004","1.2003d","1.2003c","1.2003b","1.2003","1.2002","1.2001","1.2000","1.1999c","1.1999b","1.1999","1.1998","1.1997","1.1996","1.1995","1.1994","1.1993","1.1992","1.1991","1.1990","1.1989","1.1988","1.1987","1.1986","1.1985","1.1984","1.1983","1.1982","1.1981","1.1980","1.1979","1.1978","1.1977","1.1976","1.1975","1.1974","1.1973","1.1972","1.1971","1.1970","1.1969","1.1968","1.1967","1.1966","1.1965","1.1964","1.1963","1.1962","1.1961","1.1960","1.1959","1.1958","1.1957","1.1956","1.1955","1.1954","1.1952","1.1951","1.1950","1.1949","1.1948","1.1947","1.1946","1.1945","1.1944","1.1942","1.1941","1.1940","1.1939","1.1938","1.1937","1.1936","1.1935","1.1934","1.1933","1.1932","1.1931","1.1930","1.1929","1.1928","1.1927","1.1925","1.1924","1.1923","1.1922","1.1921","1.1920","1.1919","1.1918","1.1917","1.1916","1.1915","1.1913","1.1912","1.1911","1.1910","1.1909","1.1908","1.1907","1.1906","1.1905","1.1904","1.1903","1.1902","1.1901","1.1900","1.1899","1.1898","1.1897","1.1896","1.1895","1.1894","1.1893","1.1892","1.1891","1.1890","1.1889","1.1888","1.1887","1.1886","1.1885b","1.1885","1.1884","1.1883","1.1882","1.1881","1.1879","1.1878","1.1877","1.1876","1.1875xda","1.1875","1.1874","1.1873","1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