Medium Open redirect exploit reference

CVE-2026-112040 — diem-project diem Sign-In BasedmUserActions.class.php redirect

A vulnerability was determined in diem-project diem up to 116974edfb9a5b8bd69cb13586dc62bcdbb485ad. This affects an unknown part of the file dmCorePlugin/plugins/dmUserPlugin/modules/dmUser/lib/BasedmUserActions.class.php of the component Sign-In. This manipulation of the argument Referer causes open redirect. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized. This product adopts a rolling release strategy to maintain continuous delivery. Therefore, version details for affected or updated releases cannot be specified. The project was informed of the problem early through an issue report but has not responded yet.

Published Oct 18, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulDB

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.3% (30-day exploitation probability)+2
Technical severity (medium)+3
CISA SSVC: exploitation "poc"+5
Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

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

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.26%

ahead of 16% of scored CVEs · Oct 19, 2026

Affects

Diem-project

Diem

CVSS base

4.3

Medium · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Proof of concept

none · proof-of-concept · active

Automatable

Yes

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Diem-project Diem).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Exploitation requires user interaction: tighten email/web filtering and warn affected users.
Search available logs for exploit probes matching the vulnerability class (open redirect), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Diem-project	Diem	version 116974edfb9a5b8bd69cb13586dc62bcdbb485ad	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

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

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Every base score collected

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

Score	Version	Severity	Expl.	Impact	Scored by
5.3	CVSS 4.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
2.1	CVSS 4.0	Low	—	—	cna@vuldb.com via NIST National Vulnerability Database
4.3	CVSS 3.1	Medium	2.8	1.4	cna@vuldb.com via NIST National Vulnerability Database
4.3	CVSS 3.1	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
4.3	CVSS 3.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
5.0	CVSS 2.0	Medium	10.0	2.9	cna@vuldb.com via NIST National Vulnerability Database
5.0	CVSS 2.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N (score shown at the top: cna@vuldb.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-601 · Open Redirect

Other CVEs with this weakness →

Detection

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

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
SSVC assessment updated
Oct 19, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · Received → Deferred
Oct 19, 2026 · NIST National Vulnerability Database
Affected products added · diem-project/diem
Oct 18, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 18, 2026
CVSS changed · 4.3
Oct 18, 2026 · NIST National Vulnerability Database
Source status changed · → Received
Oct 18, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 18, 2026 · Alertas do Telegram
CVE published
Oct 18, 2026 · VulDB

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 18, 2026 – Oct 18, 2026
1× Official description updated · Oct 18, 2026 – Oct 18, 2026

References

6 on the record

vuldb.com/vuln/421688
vdb-entry, technical-description, NIST National Vulnerability Database
vuldb.com/submit/1008083
third-party-advisory, NIST National Vulnerability Database
github.com/diem-project/diem/
product, NIST National Vulnerability Database
vuldb.com/cve/CVE-2026-112040
third-party-advisory, NIST National Vulnerability Database
github.com/diem-project/diem/issues/457
exploit, issue-tracking, NIST National Vulnerability Database
vuldb.com/vuln/421688/cti
signature, permissions-required, NIST National Vulnerability Database

Elsewhere on this site

Diem-project
every CVE for this vendor

Open redirect
same class

CWE-601
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-112138 diem-project diem dmCodeEditor actions.class.php join path traversal 1d
Low CVE-2026-112042 diem-project diem dmWidget dmBaseLinkTag.php text cross site scripting 1d
Low CVE-2026-112037 diem-project diem Google Analytics Client gapi.class.php certificate validation 2d
Low CVE-2026-112038 diem-project diem Version Check Service dmAdminCtrl.js html cross site scripting 2d
Low CVE-2026-112039 diem-project diem Administrative Console actions.class.php append cross site scripting 2d
Low CVE-2026-112041 diem-project diem dmString.php random weak prng 2d

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 fixed version, patch or mitigation documented.
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 record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-112040 is "diem-project diem Sign-In BasedmUserActions.class.php redirect", rated Medium. It affects Diem (Diem-project); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.3 describes technical severity. EPSS 0.26% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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