VulnerabilityPublished 4 Feb 2026

CVE-2026-0944: Drupal Group invite · Unchecked Error Condition

Affects Drupal Group inviteSource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium · fixed in 4.0.4 : update Drupal Group invite when convenient.

Data as of 26 Oct 2026, 15:59 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 13% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 4.0.4, 3.0.4, 2.3.9

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 4 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Drupal Group invite to 4.0.4, 3.0.4 or 2.3.9.

Affected software

Product	Affected	Fixed in
DrupalGroup invite	Affected >=4.0.0 <4.0.4	Fixed in 4.0.4
DrupalGroup invite	Affected >=3.0.0 <3.0.4	Fixed in 3.0.4
DrupalGroup invite	Affected <2.3.9	Fixed in 2.3.9

AI-suggested

2) In the interim, restrict access to group invitation URLs through web server configurations or application-level access controls to limit exposure to authorized users only. 3) Implement strict URL parameter validation and logging to detect and block forceful browsing attempts or unusual access patterns related to group invites. 4) Conduct regular audits of group membership and invitation workflows to identify unauthorized changes or suspicious activity. 5) Educate site administrators and developers about secure coding practices related to access control and exceptional condition handling to prevent similar vulnerabilities. 6) Consider deploying web application firewalls (WAFs) with custom rules to detect and block attempts to exploit this vulnerability until patches are applied. 7) Review and tighten Drupal permissions related to group management to minimize the attack surface. These measures, combined with timely patching, will reduce the risk of exploitation and protect sensitive group invitation data.

Description

Improper Check for Unusual or Exceptional Conditions vulnerability in Drupal Group invite allows Forceful Browsing.This issue affects Group invite: from 0.0.0 before 2.3.9, from 3.0.0 before 3.0.4, from 4.0.0 before 4.0.4.

Impact

For European organizations, the impact of CVE-2026-0944 can be substantial, especially for entities using Drupal-based platforms to manage user groups, communities, or collaborative projects. Unauthorized access to group invitations can lead to exposure of sensitive membership information, unauthorized group access, and potential manipulation of group membership workflows. This can undermine trust, lead to data leaks, and facilitate further attacks such as social engineering or privilege escalation within the affected platforms. Public sector organizations, educational institutions, and enterprises that rely on Drupal for internal or external collaboration are particularly vulnerable. The breach of group invite confidentiality could also contravene GDPR requirements regarding personal data protection, resulting in regulatory penalties and reputational damage. Since the vulnerability allows forceful browsing without user interaction, attackers can automate exploitation attempts, increasing the risk of widespread abuse if unpatched. The lack of known exploits currently limits immediate impact but does not reduce the urgency for mitigation given the potential severity.

CWE-754Improper Check for Unusual or Exceptional Conditions (opens in a new tab)
Class weaknessLikelihood of exploit: MediumOWASP Top 10 A10:2025: Mishandling of Exceptional Conditions (opens in a new tab)
The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation
Check the results of all functions that return a value and verify that the value is expected.
Implementation
If using exception handling, catch and throw specific exceptions instead of overly-general exceptions (CWE-396, CWE-397). Catch and handle exceptions as locally as possible so that exceptions do not propagate too far up the call stack (CWE-705). Avoid unchecked or uncaught exceptions where feasible (CWE-248).
OWASP Cheat Sheets
Logging (opens in a new tab)
Error Handling (opens in a new tab)
OWASP ASVS 4.0.3
V11.1.7 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

drupal.org/sa-contrib-2026-001 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Feb 2026, 20:44 UTC

WeaknessesCWE-754

Technical details

References

Community reviews

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