CVE.org (no NVD analysis yet)· CNA synology

CVE-2026-15201: An improper certificate validation vulnerability in the Support Form in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and…

MediumCVSS 5.9 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 23/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. Special conditions such as timing or configuration are required.
Fixed version: Synology DiskStation Manager (DSM) 7.3.2-86009-5, 7.4.1-90080-1.

Low priority for now. Upgrade to Synology DiskStation Manager (DSM) 7.3.2-86009-5, 7.4.1-90080-1 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

An improper certificate validation vulnerability in the Support Form in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows man-in-the-middle attackers to read arbitrary files and write specific files during support form submission.

Published: Nov 12, 2026
Updated: Nov 12, 2026
EPSS: —
CWE: CWE-295

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 23 / 40 · 5.9 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · —

CNA vs NVD score

NVD: 5.9
CNA · synology: 5.9; agree

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

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No public exploit code on record
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What does it mean in your environment?

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Affected systems

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Versions reported by the vendor

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

Synology DiskStation Manager (DSM)
- 7.4.1 and later · before 7.4.1-90080-1affected · semver
- 7.3.2 and later · before 7.3.2-86009-5affected · semver
- before 7.3.2unknown · semver

Same product

synology: all records

Other highest-scoring records for the same primary product.

CVE-2026-76954An improper neutralization of special elements used in an SQL command vulnerability in the Auth API in Synology DiskStation Manager (DSM)…
39Monitor
CVE-2026-13684An improper encoding or escaping of output vulnerability in SCGI in Synology DiskStation Manager (DSM) before 7.2.1-69057-12…
39Monitor
CVE-2026-13639An insufficient entropy vulnerability in login logic in Synology DiskStation Manager (DSM) before 7.2.1-69057-12, 7.2.2-72806-9…
39Monitor

Published before and after this one in the same product

← EarlierCVE-2026-13672Nov 12, 2026 · An authorization bypass through user-controlled key vulnerability in the SSOAuth in Synology DiskStation Manager (DSM) before 7.3.2-86009-5…
35Monitor
← EarlierCVE-2026-15198Nov 12, 2026 · A missing authentication for critical functionality vulnerability in the Webdav API in Synology DiskStation Manager (DSM) before…
26Monitor
Later →CVE-2026-16550Nov 12, 2026 · An external control of file name or path vulnerability in the Media Parser in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.
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
Synology DiskStation Manager (DSM)	7.3.2-86009-5	Vendor (CNA)
Synology DiskStation Manager (DSM)	7.4.1-90080-1	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.

PublishedNov 12, 2026
Fix recordedNov 12, 2026same day
TodayNov 12, 2026+1 d

Credits

All researchers

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

JUNYI LIU (@mosskappa)finder

Not on record for this CVE: EPSS history · patch commit or PR link · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
A user must open a link or visit a page.
Special conditions such as timing or configuration are required.

If successful

Confidentiality: high · data can be read
Integrity: low · data or configuration can be modified
Availability: none

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

Weakness class (CWE)

CWE-295 · Improper Certificate Validation

CVSS vector

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

nvd-primary

Root cause

A certificate validation error is silently swallowed instead of terminating the connection. Often, code added for a test environment makes its way into production.

The bug in code

The whole CWE-295 class

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

Vulnerable

kotlin

1override fun checkServerTrusted(chain: Array<X509Certificate>, type: String) {
2  // Left empty for the test environment
3}

Fixed

kotlin

1val client = OkHttpClient.Builder()
2  .certificatePinner(
3    CertificatePinner.Builder()
4      .add("api.sirius.example", "sha256/…")
5      .build()
6  ).build()

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

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Change log (2)

Exploit maturity— → noneNov 12, 2026, 5:07 AM UTC
Fix✗ → ✓Nov 12, 2026, 5:07 AM UTC

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

References

www.synology.com/en-global/security/advisory/Synology_SA_26_18

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

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