What is CVE-2026-85787?

CVE-2026-85787 is An incomplete list of disallowed inputs in the SQL validation component of Amazon awslabs postgres-mcp-server. The supplied enrichment data classifies it as Unclassified mapped to CWE-184 CWE-184.

Which versions are affected?

Affected product and version evidence is listed in the product table above. Current public advisories should be checked for exact version scope before patch targeting is finalized.

Is there active exploitation?

Active exploitation is not confirmed from current sources for CVE-2026-85787. If exploitation is not confirmed from current sources, teams should document that status and continue monitoring KEV, vendor, and telemetry updates.

No. CVE-2026-85787 is not listed in CISA KEV in the supplied enrichment data. KEV status should be monitored because it can change after initial disclosure or after exploitation becomes publicly confirmed.

Is there a public exploit?

A public PoC is not confirmed from current sources for CVE-2026-85787. Public exploit or PoC availability should raise triage priority, especially for exposed or business-critical systems.

How can defenders detect it?

Start with web/proxy/WAF logs, application logs, network IDS/IPS where available. Look for vulnerability-class behavior, product errors, suspicious authentication events, exploit probes, and abnormal process activity based only on evidence that applies to the affected product.

How should teams prioritize it?

Prioritize CVE-2026-85787 using CVSS 6.5, EPSS 0%, KEV status, public PoC status, and asset exposure. Internet-facing, privileged, or business-critical deployments should be handled first.

Are workarounds available?

The supplied mitigation guidance says to apply vendor patches and restrict external exposure until fixed. Fixed-version evidence is listed in the mitigation section above.

Which threat actors are linked publicly?

No public threat actor linkage is confirmed from current sources. Do not attribute exploitation to a threat actor unless the source evidence explicitly supports that linkage.

What should be done in the next 24 hours?

Identify exposed assets running affected vendor/product/version combinations. Prioritize based on EPSS, PoC availability, and external exposure. Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class. Open remediation tickets with affected assets, owners, evidence status, and detection coverage so decisions are traceable.

medium

CVE-2026-85787

CVE-2026-85787 — An incomplete list of disallowed inputs in the SQL validation component of Amazon awslabs postgres-mcp-server

An incomplete list of disallowed inputs in the SQL validation component in Amazon awslabs postgres-mcp-server before version 1.1.7 might allow an unauthenticated actor to modify data beyond the read-only scope by placing crafted SQL into the content that is submitted when an authenticated user interacts with the MCP server. To remediate this issue, users should upgrade to version 1.1.7 or above.

Published Sep 4, 2026Updated Sep 4, 2026Sources: NVD, Amazon (CNA), GitHub, GitHub Security Advisory, SOCRadar CTI

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Unreported

no source claims exploitation

EPSS

ahead of 0% of scored CVEs

Affects

Amazon

postgres-mcp-server

CVSS base

6.5

medium · 2 sources

Remediation

The vendor's own words where we have them.

Upgrade postgres-mcp-server to a fixed release. Apply vendor patches per advisory and restrict external exposure of the affected component until patched.

First 24 hours

Ordered from the record's own fields — exposure first, because you cannot patch what you have not found.

Identify exposed assets running affected vendor/product/version combinations.
Prioritize based on EPSS, PoC availability, and external exposure.
Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class.

Affected scope

Vendor, product and version as the advisories word them.

Vendor	Product	Versions	Status
Amazon	postgres-mcp-server	0 to < 1.1.7	Vulnerable

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Availability

None

Confidentiality

None

Integrity

High

Scope

Unchanged

Attack Complexity

Low

Attack Vector

Network

Privileges Req

None

User Interaction

Required

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
6.5	CVSS 3.1	medium	2.8	3.6	CNA, Amazon (CNA), GHSA
7.1	CVSS 4.0	high	—	—	Amazon (CNA)

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

What this weakness leads to

MITRE's own consequences and mitigations for the weakness class — the authority's wording, not guidance derived from the CVSS vector.

MITRE

CWE-184 · Incomplete List of Disallowed Inputs

Bypass Protection Mechanism::

Mitigation: Do not rely exclusively on detecting disallowed inputs. There are too many variants to encode a character, especially when different environments are used, so there is a high likelihood of missing some variants. Only use detection of disallowed inputs as a mechanism for detecting suspicious activity. Ensure that you are using other protection mechanisms that only identify good input - such as lists of allowed inputs - and ensure that you are properly encoding your outputs.::

Weakness & attack patterns

CWE-184

Attack patterns reported against this CVE. The ATT&CK techniques below are inferred from its weakness class.

CAPEC-120 · Double EncodingCAPEC-15 · Command DelimitersCAPEC-182 · Flash InjectionCAPEC-3 · Using Leading 'Ghost' Character Sequences to Bypass Input FiltersCAPEC-43 · Exploiting Multiple Input Interpretation LayersCAPEC-6 · Argument InjectionCAPEC-71 · Using Unicode Encoding to Bypass Validation LogicCAPEC-73 · User-Controlled FilenameCAPEC-85 · AJAX Fingerprinting

Detection

Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.

Prioritize edge telemetry for network-reachable postgres-mcp-server.

web/proxy/WAF logsapplication logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first — with the readings a source repeats on a schedule counted underneath rather than listed.

2026
Added · CVSS 3.1 6.5 (AV:N)
Sep 4, 2026 · NVD
Initial · CVE published
Sep 4, 2026 · NVD
Added · GHSA-f4f4-39r8-8gj4 published (high)
Sep 4, 2026 · GitHub Security Advisory
CVE published by MITRE.
Sep 4, 2026 · SOCRadar CTI

References

4 on the record

aws.amazon.com/security/security-bulletins/2026-101-aws/
Vendor Advisory
pypi.org/project/awslabs.postgres-mcp-server/1.1.7/
Vendor Advisory
nvd.nist.gov/vuln/detail/CVE-2026-85787
NVD
github.com/advisories/GHSA-f4f4-39r8-8gj4
Exploit, Third Party Advisory

Elsewhere on this site

Amazonevery CVE for this vendor
Unclassifiedsame class
CWE-184other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record1

What should defenders know first?

CVE-2026-85787 is An incomplete list of disallowed inputs in the SQL validation component of Amazon awslabs postgres-mcp-server, a medium vulnerability affecting postgres-mcp-server from Amazon. The current evidence does not list it in CISA KEV, and the exploit status is: Active exploitation is not confirmed from current sources for CVE-2026-85787. Public exploit evidence is: A public PoC is not confirmed from current sources for CVE-2026-85787. The affected-version evidence is listed in the key facts and affected products tables. Defenders should first verify whether exposed or business-critical assets run those versions, then apply vendor patches or mitigations, restrict reachable attack surface, and preserve logs for detection review. CVSS 6.5 describes technical severity, while EPSS 0% helps estimate near-term exploit likelihood; neither replaces asset context. Unknown fields should remain explicit in tickets, and threat actor, IOC, victimology, or payload claims should not be added unless a cited source supports them. Monitor CISA KEV, vendor advisories, NVD changes, public PoC repositories, and internal telemetry for update triggers.