What’s Vulnerable › Vulnerabilities

CVE-2021-25980: Talkyard - Host-Header Injection Leads to Account Takeover

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-11 · updated 2026-06-17
• Weakness: CWE-74

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.

Affected products

• debiki talkyard: from 0.04.01 through 0.6.74-wip-63220cb; from 0.2020.22-wip-b2e97fe0e through 0.2021.02-wip-879ef3fe1; from tyse-v0.2021.02-879ef3fe1-regular through tyse-v0.2021.28-af66b6905-regular

References

• https://github.com/debiki/talkyard/commit/4067e191a909ed06f250d09a40e43aa5edbb0289
• https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25980
• https://github.com/debiki/talkyard/commit/4067e191a909ed06f250d09a40e43aa5edbb0289
• https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25980

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