MRBS before 1.13.0 contains a password reset poisoning vulnerability that allows unauthenticated attackers to redirect reset links by forging the Host header when $url_base is unset. Attackers can request a reset for a victim so AuthDb::notifyUser() emails a link pointing to their host, capturing the reset key when opened to take over accounts including administrators.
{
"cna_assigner": "VulnCheck",
"cwe_ids": [
"CWE-640"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/129xxx/CVE-2026-129134.json",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"fixed": "1.13.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
},
{
"extracted_events": [
{
"range": [
{
"fixed": "1.13.0"
}
],
"source": "DESCRIPTION"
}
]
}
]
}{
"extracted_events": [
{
"range": [
{
"fixed": "92f6f5610072ddb9e1b38074c410fc8be56947ed"
}
],
"source": "REFERENCES_COMMIT"
},
{
"original_tag": "v1.13.0",
"range": [
{
"fixed": "383c98214deed41ee05ce2cd3e7a57c3f72a0af0"
}
],
"source": "REFERENCES_TAG"
}
]
}