Security readout for executives and security teams
Plain-English summary
A critical Mahara access-control flaw can allow an unauthenticated attacker to access internal accounts through LTI integrations under certain circumstances. Successful abuse could expose or alter sensitive information and disrupt service. The available sources do not define those circumstances, so organizations using Mahara LTI should treat potential exposure as urgent.
Executive priority
Treat as an immediate patching and exposure-review priority for Mahara environments using LTI. Assign ownership today, identify reachable instances, preserve relevant logs, and verify upgrades. Escalate incident review if unexplained internal-account access is found. Current evidence supports severe potential impact but not confirmed exploitation in the wild.
Technical view
CVE-2026-42163 affects Mahara versions before 25.04.5 and 26.04.0 and applies to LTI 1.1 and LTI 1.3 Advantage. It is classified as CWE-284 and scored CVSS 3.1 9.8, reflecting network access, low complexity, no required privileges or interaction, and potentially high confidentiality, integrity, and availability impact.
Likely exposure
Internet-reachable Mahara deployments using LTI 1.1 or LTI 1.3 Advantage are the clearest risk population. Exposure depends on unspecified circumstances and configuration details. Deployments without LTI may be less exposed, but the supplied sources do not establish that they are categorically unaffected.
Exploitation context
The supplied record is not in CISA KEV, and no cited source establishes active exploitation or public exploit availability. Nevertheless, the unauthenticated, network-accessible attack characteristics and potential internal-account access make rapid defensive action appropriate. The exact prerequisite conditions remain undocumented in the supplied material.
Researcher notes
The record identifies improper authorization but provides limited root-cause detail. Assessment should focus on LTI trust establishment, identity mapping, and authorization boundaries for internal accounts across both supported LTI generations. Avoid assuming a single protocol-specific cause. The supplied sources do not describe attack prerequisites, affected configurations, indicators, or proof-of-concept details.
Mitigation direction
- Upgrade affected Mahara branches to 25.04.5 or 26.04.0, following Mahara's published guidance.
- Inventory Mahara deployments and identify enabled LTI 1.1 and LTI 1.3 Advantage integrations.
- Restrict unnecessary network access to Mahara while upgrades and exposure assessment are underway.
- Review Mahara's advisory for configuration-specific mitigations or prerequisites not included in the CVE record.
Validation and detection
- Confirm each deployed Mahara version is 25.04.5, 26.04.0, or a later supported release.
- Verify whether LTI 1.1 or LTI 1.3 Advantage is enabled on each instance.
- Review authentication and account-access logs for unexplained internal-account sessions or changes.
- Test LTI authentication and account mapping defensively after upgrading, without using production accounts.
- Confirm compensating access restrictions remain effective until every affected instance is upgraded.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-42163 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://mahara.org/interaction/forum/topic.php?id=10077CVE reference, mitre
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.