NVD / CVE Program· CNA suse

CVE-2026-93539: Unauthenticated GitRepo Spec Mutation via Fleet Git Webhook Receiver

Noroxi assessment

Priority: Monitor (action score 21/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: SUSE Rancher 0.16.2.

Low priority for now. Upgrade to SUSE Rancher 0.16.2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A vulnerability was discovered in Fleet's Git webhook receiver (the gitjob webhook service). When a webhook secret is not configured, incoming webhook requests are accepted without verification, and processing a request can change the spec.pollingInterval field of a matching GitRepo resource in any namespace. A caller with network access to the webhook service and no Kubernetes credentials can therefore alter GitRepo configuration outside the namespaces they are authorized for. This only affects SUSE Rancher Fleet 0.16 before 0.16.2, older versions are not affected.

MediumCVSS 5.4 · v3.1—No exploit Fix available

Auth bypass

EUVD-2026-88296

Published: Sep 28, 2026
Updated: Oct 7, 2026
EPSS: 0.2% · 14th percentile
CWE: CWE-306

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 21 / 40 · 5.4 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · suse: 5.4; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
suse	rancher fleet	cpe:2.3:a:suse:rancher_fleet

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

suse rancher fleet0.16.0 and later · before 0.16.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (suse). Independent of NVD's CPE analysis and usually ahead of it.

SUSE Rancher
- 0.16.0 and later · before 0.16.2affected · semver

Same product

suse: all records

Other highest-scoring records for the same primary product.

CVE-2026-44935Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer
39Monitor
CVE-2026-41050Helm impersonation bypass of `RESTClientGetter` retains `cluster-admin` during template rendering
39Monitor
CVE-2026-88808Fleet agent copies downstream resources with cluster-admin privileges, allowing cross-namespace writes on downstream clusters
35Monitor

Published before and after this one in the same product

← EarlierCVE-2026-93537Sep 28, 2026 · Path traversal in Fleet Helm valuesFiles allows disclosure of files outside the bundle directory
26Monitor
← EarlierCVE-2026-93538Sep 28, 2026 · Cross-tenant BundleDeployment and Secret disclosure via spoofed cluster labels during agent-initiated registration in Fleet
28Monitor
Later →CVE-2026-93540Sep 28, 2026 · Fleet applies namespace labels and annotations without the bundle's service account privileges
26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
SUSE Rancher	0.16.2	Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedSep 28, 2026
Fix recordedSep 28, 2026same day
TodayNov 3, 2026+36 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

https://github.com/Pig-Tailfinder

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

—

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

CVE-2026-935370 days apartPath traversal in Fleet Helm valuesFiles allows disclosure of files outside the bundle directory
26Monitor
CVE-2026-7503625 days apartFleet: DNS exfiltration via Sprig getHostByName in fleet.yaml Helm template preprocessing
21Monitor
CVE-2026-4494890 days apartPath Traversal in Rancher Fleet ImageScan GitRepo Path Handler
21Monitor
CVE-2026-4493684 days apartRancher Fleet SSRF in Bundle Reader via Unvalidated Helm Repository URL in fleet.yaml
20Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: low · data or configuration can be modified
Availability: low · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: Low
Availability impact: Low

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

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

nvd-secondary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1// Added for the support team
2app.post("/maintenance/reset", resetDevice);

Fixed

1if (config.maintenanceEnabled) {
2  app.post(
3    "/maintenance/reset",
4    requireSession, requireRole("admin"), resetDevice
5  );
6}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 8:49 PM UTC
SSVC exploitation— → noneSep 28, 2026, 8:49 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/rancher/fleet/security/advisories/GHSA-8vfv-33cg-g75q

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records