NVD / CVE Program· CNA cisco

CVE-2026-20251: Remote Code Execution through Deserialization of Untrusted Data in Splunk Secure Gateway

HighCVSS 8.8 · v3.1—Proof of concept No fix recorded

Noroxi assessment

Priority: Plan (action score 44/100)

Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
Probability of exploitation in the next 30 days: 30.6% (FIRST EPSS); higher than 98.2% of all records.
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.
According to the record, no fixed version is available yet.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Add it to your regular patch cycle. Update when a fix is released; follow the vendor's advisory.

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

In Splunk Enterprise versions below 10.2.4, 10.0.7, 9.4.12, and 9.3.13, Splunk Cloud Platform versions below 10.3.2512.12, 10.2.2510.14, 10.1.2507.22, and 9.3.2411.132, and Splunk Secure Gateway versions below 3.10.6, 3.9.20, and 3.8.67, a low-privileged user that does not hold the 'admin' or 'power' Splunk roles could perform a Remote Code Execution (RCE) through the Splunk Secure Gateway app.<br><br>The Remote Code Execution is possible because of unsafe deserialization of App Key Value Store (KV Store) data through the ‘jsonpickle’ Python library, which reconstructs arbitrary Python objects from specially crafted JavaScript Object Notation (JSON) without adequate validation.

Published: Jun 10, 2026
Updated: Jun 17, 2026
EPSS: 30.6% · 98th percentile
CWE: CWE-502

Report tools

JSON

Action score

Plan

Add it to your regular patch cycle.

CVSS: 35 / 40 · 8.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 9 / 30 · 30.6%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · cisco: 8.8; 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
Proof of concept exists, no weaponized module
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

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
splunk	splunk	cpe:2.3:a:splunk:splunk
splunk	splunk cloud platform	cpe:2.3:a:splunk:splunk_cloud_platform
splunk	splunk secure gateway	cpe:2.3:a:splunk:splunk_secure_gateway

Versions reported by the vendor

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

Splunk Splunk Cloud Platform
- 10.3.2512 and later · before 10.3.2512.12affected
- 10.2.2510 and later · before 10.2.2510.14affected
- 10.1.2507 and later · before 10.1.2507.22affected
- 9.3.2411 and later · before 9.3.2411.132affected
Splunk Splunk Enterprise
- 10.2 and later · before 10.2.4affected
- 10.0 and later · before 10.0.7affected
- 9.4 and later · before 9.4.12affected
- 9.3 and later · before 9.3.13affected
Splunk Splunk Secure Gateway
- 3.10 and later · before 3.10.6affected
- 3.9 and later · before 3.9.20affected
- 3.8 and later · before 3.8.67affected

Affected versions · NVD (11)

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

splunk splunk9.3.0 and later · before 9.3.13
splunk splunk9.4.0 and later · before 9.4.12
splunk splunk10.0.0 and later · before 10.0.7
splunk splunk10.2.0 and later · before 10.2.4
splunk splunk cloud platform9.3.2411 and later · before 9.3.2411.132
splunk splunk cloud platform10.1.2507 and later · before 10.1.2507.22
splunk splunk cloud platform10.2.2510 and later · before 10.2.2510.14
splunk splunk cloud platform10.3.2512 and later · before 10.3.2512.12
splunk splunk secure gateway3.8.0 and later · before 3.8.67
splunk splunk secure gateway3.9.0 and later · before 3.9.20
splunk splunk secure gateway3.10.0 and later · before 3.10.6

Same product

splunk: all records

Other highest-scoring records for the same primary product.

CVE-2026-20253Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk EnterpriseKEV
98Now
CVE-2018-11409Splunk through 7.0.1 allows information disclosure by appending __raw/services/server/info/server-info?output_mode=json to a query, as…
60This week
CVE-2023-32707‘edit_user’ Capability Privilege Escalation
59Plan

Published before and after this one in the same product

← EarlierCVE-2026-20239May 20, 2026 · Sensitive Information Disclosure through Log Files in Splunk Enterprise
26Monitor
← EarlierCVE-2026-20240May 20, 2026 · Denial of Service through coldToFrozen.sh Script in Splunk Enterprise
26Monitor
Later →CVE-2026-20252Jun 10, 2026 · Server-Side Request Forgery (SSRF) through Dashboard Studio PDF Export in Splunk Enterprise
30Monitor

Remediation

Which version to upgrade to

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

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Proof-of-concept repository on GitHub	stars:3	2026-06-26

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.

PublishedJun 10, 2026
First PoCJun 26, 2026+15 d
TodayNov 13, 2026+156 d

EPSS, last 120 days

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

Credits

All researchers

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

M Mahdan Argya Syarif (0xbeludan)

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-2026-202530 days apartUnauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk EnterpriseKEV
98Now

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-26-0364 · Jun 11, 2026(Splunk Enterprise/Cloud/SOAR Güvenlik Bildirimi)

All national notices →

Not on record for this CVE: patch commit or PR link · public bounty program.

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: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

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

Weakness class (CWE)

CWE-502 · Deserialization of Untrusted Data

CVSS vector

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

nvd-secondary

Root cause

Data received over the network is deserialized into the language’s native object format without verifying its source. Code paths inside the object can be triggered during deserialization.

The bug in code

The whole CWE-502 class

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

Vulnerable

python

1payload = sock.recv(65536)
2job = pickle.loads(payload)

Fixed

python

1payload = sock.recv(65536)
2if not hmac.compare_digest(sign(payload), header_sig):
3    raise PermissionError("invalid signature")
4job = JobSchema.validate(json.loads(payload))

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)

Object InjectionCAPEC-586likelihood: Medium · High

ATT&CK techniques

—

Change log (0)

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

advisory.splunk.com/advisories/SVD-2026-0601

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

All records