CVE-2026-76239
Stigmem before 0.9.0a11 SSRF via unvalidated webhook delivery_address
Description
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.
INFO
Published Date :
Aug. 19, 2026, 2:17 p.m.
Last Modified :
Oct. 24, 2026, 1:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Stigmem to version 0.9.0a11 or later.
- Validate all webhook subscription delivery addresses.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-76239.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-76239 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-76239
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-76239 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-76239 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Changed Translation Title: stigmem-node de eidetic-labs, Description: Stigmem anterior a 0.9.0a11 no valida el parámetro delivery_address al crear suscripciones de webhook, lo que permite a los usuarios autenticados especificar destinos internos de loopback y de red privada. Los atacantes pueden desencadenar eventos de cambio de hechos coincidentes para hacer que el servidor Stigmem emita solicitudes HTTP POST del lado del servidor a servicios internos, lo que permite ataques SSRF ciegos contra localhost y puntos finales de red privada. Title: stigmem-node de eidetic-labs, Description: Stigmem anterior a 0.9.0a11 no valida el parámetro delivery_address al crear suscripciones de webhook, lo que permite a los usuarios autenticados especificar destinos internos de loopback y de red privada. Los atacantes pueden desencadenar eventos de cambio de hechos coincidentes para hacer que el servidor Stigmem emita solicitudes HTTP POST del lado del servidor a servicios internos, lo que permite ataques SSRF ciegos contra localhost y puntos finales de red privada. -
CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: stigmem-node de eidetic-labs, Description: Stigmem anterior a 0.9.0a11 no valida el parámetro delivery_address al crear suscripciones de webhook, lo que permite a los usuarios autenticados especificar destinos internos de loopback y de red privada. Los atacantes pueden desencadenar eventos de cambio de hechos coincidentes para hacer que el servidor Stigmem emita solicitudes HTTP POST del lado del servidor a servicios internos, lo que permite ataques SSRF ciegos contra localhost y puntos finales de red privada. -
CVE Modified by [email protected]
Aug. 21, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'eidetic-labs', 'product': 'stigmem', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.9.0a11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '0.9.0a11', 'versionType': 'semver'}], 'packageURL': 'pkg:pypi/stigmem-node', 'defaultStatus': 'unaffected'}] [{'vendor': 'eidetic-labs', 'product': 'stigmem-node', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.9.0a11', 'versionType': 'python'}, {'status': 'unaffected', 'version': '0.9.0a11', 'versionType': 'python'}], 'packageURL': 'pkg:pypi/stigmem-node', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 19, 2026
Action Type Old Value New Value Added Reference https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236 Added SSVC {'id': 'CVE-2026-76239', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-19T14:42:36.356429Z'} -
New CVE Received by [email protected]
Aug. 19, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'eidetic-labs', 'product': 'stigmem', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.9.0a11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '0.9.0a11', 'versionType': 'semver'}], 'packageURL': 'pkg:pypi/stigmem-node', 'defaultStatus': 'unaffected'}] Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L Added CWE CWE-918 Added Reference https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236 Added Reference https://www.vulncheck.com/advisories/stigmem-before-0a11-ssrf-via-unvalidated-webhook-delivery-address