TI-2021-07986 Aliases CVE-2021-25980 GHSA-j8p2-hh7r-9r58

Talkyard - Host-Header Injection Leads to Account Takeover

HIGH 73CWE-74Published 2021-11-11 · Updated 2025-04-30

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01251 69th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
debiki	talkyard	v0.04.01 and later; v0.2020.22-WIP-b2e97fe0e and later; v0.2021 – v0.2021.02-WIP-879ef3fe1; tyse-v0.2021.02-879ef3fe1-regular and later	—	No fix listed	CNA

talkyard Vendordebiki Affected v0.04.01 and later; v0.2020.22-WIP-b2e97fe0e and later; v0.2021 – v0.2021.02-WIP-879ef3fe1; tyse-v0.2021.02-879ef3fe1-regular and later Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:talkyard:talkyard::::::::	0.04.01 – 0.6.74-wip-63220cb; 0.2020.22-wip-b2e97fe0e – 0.2021.02-wip-879ef3fe1; tyse-v0.2021.02-879ef3fe1-regular – tyse-v0.2021.28-af66b6905-regular	Vulnerable	Talkyard

cpe:2.3:a:talkyard:talkyard:*:*:*:*:*:*:*:* Versions 0.04.01 – 0.6.74-wip-63220cb; 0.2020.22-wip-b2e97fe0e – 0.2021.02-wip-879ef3fe1; tyse-v0.2021.02-879ef3fe1-regular – tyse-v0.2021.28-af66b6905-regular Vulnerable ·Talkyard

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-25980
2026-10-03 Alias added: GHSA-j8p2-hh7r-9r58

References

Patch 1

https://github.com/debiki/talkyard/commit/4067e191a909ed06f250d09a40e43aa5edbb0289

Advisory 1

https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25980

TI-2021-07987 Talkyard - Insufficient Session Expiration CVSS 3.1CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences