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CVE-2026-75511

📛 CVE Title

Novu: Server-Side Request Forgery (SSRF) via Chat Provider Webhook URLs

⬇ Download JSON

Description

Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu accepts chat webhook URLs from subscriber credentials.webhookUrl, channel endpoint endpoint.url, event payload.webhookUrl, and event overrides.webhookUrl, then passes the selected endpoint.url through send-message-chat.usecase.ts to raw HTTP requests in the Slack, Discord, Mattermost, Microsoft Teams, Grafana On-Call, Ryver, Rocket.Chat, GetStream, and Zulip providers. An authenticated user can supply an internal or otherwise restricted destination because these paths do not apply normalizeOutboundHttpUrl, assertSafeOutboundUrl, or the DNS-pinned safeOutboundJsonRequest protection used by the generic webhook providers. The Novu worker can consequently issue attacker-directed POST requests to internal network services and cause interactions or actions supported by those services. This issue is fixed in version 3.18.0.

Overview

State
PUBLISHED
Assigner (CNA)
GitHub_M
CVSS severity
MEDIUM
CVSS score
CVSS 5.3 / 10 5.3 5.3 / 10
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
Effective score
5.3 / 10 MEDIUM source: CNA overview
CWE(s)
CWE-918
Reserved
2026-08-17
Published
2026-09-22 15:49 UTC
Last updated
2026-09-22 15:49 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/75xxx/CVE-2026-75511.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-09-22 16:17:54 UTC
NVD last modified
2026-09-22 16:17:54 UTC

NVD / KEV / EPSS data refreshed 2026-09-23 02:45 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-84536
Assigner
GitHub_M
Published
Sep 22, 2026, 3:49:37 PM
Updated
Sep 22, 2026, 3:49:37 PM
EUVD base score (CVSS 4.0)
5.3 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
EUVD-reported EPSS
0.0000
Vendors
novuhq, @novu
Products
api-service (< 3.18.0)
novu (< 3.18.0)

ENISA description: Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu accepts chat webhook URLs from subscriber credentials.webhookUrl, channel endpoint endpoint.url, event payload.webhookUrl, and event overrides.webhookUrl, then passes the selected endpoint.url through send-message-chat.usecase.ts to raw HTTP requests in the Slack, Discord, Mattermost, Microsoft Teams, Grafana On-Call, Ryver, Rocket.Chat, GetStream, and Zulip providers. An authenticated user can supply an internal or otherwise restricted destination because these paths do not apply normalizeOutboundHttpUrl, assertSafeOutboundUrl, or the DNS-pinned safeOutboundJsonRequest protection used by the generic webhook providers. The Novu worker can consequently issue attacker-directed POST requests to internal network services and cause interactions or actions supported by those services. This issue is fixed in version 3.18.0.

EUVD references (4)

Affected products (2)
VendorProductVersionsPlatforms
novuhq novu < 3.18.0 (affected) —
@novu api-service < 3.18.0 (affected) —

Vendor references (4)

References embedded in the original CVE record by the assigning CNA.

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (4)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (10)

  • Update Software, Mitigation M1051 - Enterprise | MITRE ATT&CK®
    web:attack.mitre.org

    This mitigation can be implemented through the following measures: Regular Operating System Updates Implementation: Apply the latest Windows security updates monthly using WSUS (Windows Server Update Services) or a similar patch management solution. Configure systems to check for updates automatically and schedule reboots during maintenance ...

    2026-09-23 15:45 UTC
  • July 2026 Critical Patch Update Released | security - Oracle Blogs
    web:blogs.oracle.com

    For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

    2026-09-23 15:45 UTC
  • Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva
    web:senserva.com

    Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

    2026-09-23 15:45 UTC
  • Portal for ArcGIS Security 2026 Update 2 Patch - Esri Support
    web:support.esri.com

    This patch deals specifically with the issues listed below under Issues Addressed with this Patch . As part of the patch installation, the Portal for ArcGIS service is stopped and restarted. The restart may take several minutes depending on the number of items on the enterprise deployment. As a best practice, clear the browser cache and re-launch the browser after installing the patch . This ...

    2026-09-23 15:45 UTC
  • July 18, 2026—Hotpatch KB5121768 (OS Builds 26200.8893 and 26100.8893 ...
    web:support.microsoft.com

    This out-of-band (OOB) update for Windows 11, version 25H2 and Windows 11, version 24H2 (KB5121768) is cumulative. It includes all improvements from previous security and non-security updates, along with an additional fix . Improvements This OOB update includes the following improvement: [System Performance] This update addresses an issue affecting a limited number of devices with an Intel ...

    2026-09-23 15:45 UTC
  • March 10, 2026—Hotpatch KB5079420 (OS Builds 26200.7979 and 26100.7979 ...
    web:support.microsoft.com

    This Hotpatch update for Windows 11, version 25H2 and 24H2 (KB5079420), improves functionality, performance, and reliability. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of ...

    2026-09-23 15:45 UTC
  • SAP Security Patch Day - June 2026
    web:support.sap.com

    SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 9th of June 2026 , SAP security patch day saw the release of 15 new security notes.

    2026-09-23 15:45 UTC
  • The 8 Best Automated Vulnerability Remediation Tools in 2026
    web:www.openhands.dev

    Compare 8 automated vulnerability remediation tools for 2026 on fixes, prioritization, integrations, and deployment control.

    2026-09-23 15:45 UTC
  • Oracle Critical Patch Update Advisory - July 2026
    web:www.oracle.com

    This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

    2026-09-23 15:45 UTC
  • Oracle Critical Security Patch Update Advisory - June 2026
    web:www.oracle.com

    Additional CVEs addressed are: The patch for CVE - 2026 -34481 also addresses CVE - 2026 -34477, CVE - 2026 -34478, CVE - 2026 -34479, and CVE - 2026 -34480. Oracle Fusion Middleware Risk Matrix This Critical Security Patch Update contains 106 new security patches for Oracle Fusion Middleware. 53 of these vulnerabilities may be remotely exploitable without authentication, i.e., may be exploited over a ...

    2026-09-23 15:45 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-75511.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "novu",
          "vendor": "novuhq",
          "versions": [
            {
              "status": "affected",
              "version": "< 3.18.0"
            }
          ]
        },
        {
          "product": "api-service",
          "vendor": "@novu",
          "versions": [
            {
              "status": "affected",
              "version": "< 3.18.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu accepts chat webhook URLs from subscriber credentials.webhookUrl, channel endpoint endpoint.url, event payload.webhookUrl, and event overrides.webhookUrl, then passes the selected endpoint.url through send-message-chat.usecase.ts to raw HTTP requests in the Slack, Discord, Mattermost, Microsoft Teams, Grafana On-Call, Ryver, Rocket.Chat, GetStream, and Zulip providers. An authenticated user can supply an internal or otherwise restricted destination because these paths do not apply normalizeOutboundHttpUrl, assertSafeOutboundUrl, or the DNS-pinned safeOutboundJsonRequest protection used by the generic webhook providers. The Novu worker can consequently issue attacker-directed POST requests to internal network services and cause interactions or actions supported by those services. This issue is fixed in version 3.18.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T15:49:37.481Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/novuhq/novu/security/advisories/GHSA-pg9q-8v57-hqph",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/novuhq/novu/security/advisories/GHSA-pg9q-8v57-hqph"
        },
        {
          "name": "https://github.com/novuhq/novu/pull/11455",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/novuhq/novu/pull/11455"
        },
        {
          "name": "https://github.com/novuhq/novu/commit/dabfd66457c0b98ad46a8186e69f74f570a990c2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/novuhq/novu/commit/dabfd66457c0b98ad46a8186e69f74f570a990c2"
        },
        {
          "name": "https://github.com/novuhq/novu/releases/tag/v3.18.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/novuhq/novu/releases/tag/v3.18.0"
        }
      ],
      "source": {
        "advisory": "GHSA-pg9q-8v57-hqph",
        "discovery": "UNKNOWN"
      },
      "title": "Novu: Server-Side Request Forgery (SSRF) via Chat Provider Webhook URLs"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-75511",
    "datePublished": "2026-09-22T15:49:37.481Z",
    "dateReserved": "2026-08-17T20:49:21.599Z",
    "dateUpdated": "2026-09-22T15:49:37.481Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}