CVE-2026-76239 PUBLISHED

Stigmem before 0.9.0a11 SSRF via unvalidated webhook delivery_address

Assigner: VulnCheck
Reserved: 19.08.2026 Published: 19.08.2026 Updated: 19.08.2026

Stigmem before 0.9.0a11 fails to validate the delivery_address parameter when creating webhook subscriptions, allowing authenticated users to specify internal loopback and private network destinations. Attackers can trigger matching fact-change events to cause the Stigmem server to issue server-side HTTP POST requests to internal services, enabling blind SSRF attacks against localhost and private network endpoints.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS Score: 5.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS Score: 6.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	eidetic-labs
Product	stigmem
Versions	Default: unaffected affected from 0 to 0.9.0a11 (excl.) Version 0.9.0a11 is unaffected

CVE-2026-76239 PUBLISHED

Stigmem before 0.9.0a11 SSRF via unvalidated webhook delivery_address

Metrics

Product Status

Credits

References

Problem Types