HighCVE-2026-88809

Rancher meta proxy allowlist bypass leading to server-side request forgery (CVE-2026-88809)

Published 02.11.2026Last modified 02.11.2026Sources: BSI, CVE.org, pwn.watch

What is affected, what to do

Update SUSE Rancher to version 2.15.3, SUSE Rancher to version 2.14.7, SUSE Rancher to version 2.13.11.

Affected: SUSE Rancher lt 2.15.0..2.15.3
SUSE Rancher lt 2.14.0..2.14.7
SUSE Rancher lt 2.13.0..2.13.11
SUSE Rancher lt 2.12.0..2.12.15
SUSE Rancher lt 2.11.0..2.11.19
Fixed in: SUSE Rancher 2.15.3
SUSE Rancher 2.14.7
SUSE Rancher 2.13.11
SUSE Rancher 2.12.15
SUSE Rancher 2.11.19

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

7.6

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: Vendor (CNA), CVSS v3

7.6

CVSS v3

Severity High on the scale from 0 to 10.

Source: BSI, CVE.org, pwn.watch

—

EPSS score

No value is available for this vulnerability.

Show all metrics

Severity: High
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 68.00 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: no public PoC known
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 7.6 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 7.6
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 02.11.2026
CISA assessment (SSVC): Exploitation: none known · not automatable · Technical impact: partial; Source: CISA Vulnrichment, as of 2 November 2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-918

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

A security vulnerability exists in the SUSE Rancher Manager meta proxy endpoint (/meta/proxy). This endpoint is intended to forward requests only to destinations that appear on a configured allowlist. The allowlist decision was evaluated in a place where it could not stop a request from being forwarded, so a rejected destination was logged but the request was still handed to the proxy's transport. This affects SUSE Rancher 2.15.0 up to 2.15.3, 2.14.0 up to 2.14.7, 2.13.0 up to 2.13.11, 2.12.0 up to 2.12.15, 2.11.0 up to 2.11.19 and potentially older EOL versions.

Source: BSI WID Portal, BSI CSAF, cvelistv5, NVD (NIST), CVE.org (MITRE), pwn.watch

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
SUSE	Rancher	`2.12.0 – < 2.12.15` `2.11.0 – < 2.11.19` `2.15.0 – < 2.15.3` `2.13.0 – < 2.13.11` `2.14.0 – < 2.14.7`	`2.12.15` `2.11.19` `2.15.3` `2.13.11` `2.14.7`
Rancher	Rancher	`< 2.15.3` `< 2.11.19` `< 2.14.7` `< 2.13.11` `< 2.12.15`	`2.15.3` `2.11.19` `2.14.7` `2.13.11` `2.12.15`

Vendors and products

Weakness classes (CWE)

CWE-918Server-Side Request Forgery (SSRF)
Base
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
Entry at MITRE CWE-918

References & sources

pwn.watchpwn.watch: Rancher and Fleet October 2026 security release: any Rancher user could become cluster-admin on the management cluster (CVE-2026-94290)pwn-watch
documentation.suse.comSecurity Advisories and CVEs (Rancher Manager v2.15)pwn-watch
github.comPrivilege escalation to cluster-admin on the Rancher local cluster through Fleet's agent management controller (GHSA-qfmw-gw96-ffcr)pwn-watch
github.comCluster identity takeover in Fleet cluster registration (GHSA-gx8v-2929-9q95)pwn-watch
github.comAuthorization bypass on the local cluster shell endpoint (GHSA-8x6f-2v58-x6p7)pwn-watch
github.comRancher meta proxy allowlist bypass leading to server-side request forgery (GHSA-f9gf-wh3x-jx3v)pwn-watch, Vendor advisory
github.comRancher credentials disclosed to third-party hosts by the Rancher Manager meta proxy (GHSA-x82x-2qj6-5rm2)pwn-watch
documentation.suse.comRancher Manager v2.15.3 release notespwn-watch

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

02.11.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: none known, automatable: no

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	added	—	{"id":"CVE-2026-88809","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-11-02T18:55:07.528740Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

02.11.2026Receivedsuse.de

CVSS V3.1: AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N

Weakness type: CWE-918

Description added or changed

New references:

https://github.com/rancher/rancher/security/advisories/GHSA-f9gf-wh3x-jx3v

Show 5 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Description	added	—	A security vulnerability exists in the SUSE Rancher Manager meta proxy endpoint (/meta/proxy). This endpoint is intended to forward requests only to destinations that appear on a configured allowlist. The allowlist decision was evaluated in a place where it could not stop a request from being forwarded, so a rejected destination was logged but the request was still handed to the proxy's transport. This affects SUSE Rancher 2.15.0 up to 2.15.3, 2.14.0 up to 2.14.7, 2.13.0 up to 2.13.11, 2.12.0 up to 2.12.15, 2.11.0 up to 2.11.19 and potentially older EOL versions.
CVSS	added	—	AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N
Weakness type (CWE)	added	—	CWE-918
Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/88xxx/CVE-2026-88809.json">CVE-2026-88809</a>
Reference	added	—	https://github.com/rancher/rancher/security/advisories/GHSA-f9gf-wh3x-jx3v

Source identifier: meissner@suse.de

Embed badge

Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.

<a href="https://intel.neosec.eu/en/cve/CVE-2026-88809"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-88809.svg?lang=en" alt="CVE-2026-88809 – NEOSEC Intel" height="20"></a>