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CVE-2021-25980

Talkyard - Host-Header Injection Leads to Account Takeover

HIGH
8.8
CVSS Score
Published: November 11, 2021 at 07:10 AM UTC
Updated: June 17, 2026 at 03:42 AM UTC
2 products affected across 2 vendorsTalkyardTalkyard

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Severity
HIGH8.8
Exploit prediction
EPSS 1%
SSVC
PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Talkyard· Talkyard
95%
0.04.01 ≤ v ≤ 0.6.74-wip-63220cb0.2020.22-wip-b2e97fe0e ≤ v ≤ 0.2021.02-wip-879ef3fe1tyse-v0.2021.02-879ef3fe1-regular ≤ v ≤ tyse-v0.2021.28-af66b6905-regular
Talkyard· Debiki
60%
tyse-v0.2021.02-879ef3fe1-regular ≤ v < tyse-v0.2021*v0.04.01 ≤ v < v0*v0.2020.22-WIP-b2e97fe0e ≤ v < v0.2020*v0.2021 ≤ v ≤ v0.2021.02-WIP-879ef3fe10.04.010.2020.22-WIP-b2e97fe0e0.2021tyse-v0.2021.02-879ef3fe1-regular
Affected range stops below tyse-v0.2021*, so it looks safe — our inference, not a vendor statement
Affected range stops below v0*, so it looks safe — our inference, not a vendor statement
Affected range stops below v0.2020*, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/debiki/talkyard/commit/4067e191a909ed06f250d09a40e43aa5edbb0289
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25980

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHMend
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-74

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