title: Talkyard - Host-Header Injection Leads to Account Takeover
description: In Talkyard, versions v0.04.01 through v0.6.74-WIP-63220cb, v0.2020.22-WIP-b2e97fe0e through v0.2021.02-WIP-879ef3fe1 and tyse-v0.2021.02-879ef3fe1-regular through tyse-v0.2021.28-af66b6905-regular, are vulnerable to Host Header Injection. By luring a victim application-user to click on a link, an unauthenticated attacker can use the “forgot password” functionality to reset the victim’s password and successfully take over their account.
problem types: CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
affected:
{
product: talkyard
vendor: debiki
versions:
lessThan: v0*, status: affected, version: v0.04.01, versionType: custom
lessThan: v0.2020*, status: affected, version: v0.2020.22-WIP-b2e97fe0e, versionType: custom
lessThanOrEqual: v0.2021.02-WIP-879ef3fe1, status: affected, version: v0.2021, versionType: custom
lessThan: tyse-v0.2021*, status: affected, version: tyse-v0.2021.02-879ef3fe1-regular, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 8.8
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
version: 3.1
]
solutions: Update to tyse-v0.2021.29-8cb7f73fe-regular or later