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CVE Record

CVE-2017-17454: Mahara 16.10 before 16.10.7 and 17.04 before 17.04.5 and 17.10 before 17.10.2 have a Cross Site Scripting (...

Mahara 16.10 before 16.10.7 and 17.04 before 17.04.5 and 17.10 before 17.10.2 have a Cross Site Scripting (XSS) vulnerability when a user enters invalid UTF-8 characters. These are now going to be discarded in Mahara along with NULL characters and invalid Unicode characters. Mahara will also avoid direct $_GET and $_POST usage where possible, and instead use param_exists() and the correct param_*() function to fetch the expected value.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Cross Site Scripting issue in older Mahara releases. A user submitting invalid UTF-8 characters could trigger unsafe handling of input. Successful XSS can affect user trust, session security, or content integrity, but the supplied sources do not show active exploitation or a CVSS score.

Executive priority

Prioritize remediation for internet-facing or broadly used Mahara sites. The issue is not supported as actively exploited by the supplied sources, but XSS in a collaboration platform can affect accounts and posted content, so delayed upgrades create avoidable risk.

Technical view

Mahara 16.10 before 16.10.7, 17.04 before 17.04.5, and 17.10 before 17.10.2 mishandled invalid UTF-8, NULL, and invalid Unicode input. The fix discards those characters and reduces direct $_GET and $_POST access in favor of Mahara param_exists() and param_*() input helpers.

Likely exposure

Exposure is likely limited to organizations running the affected Mahara versions. Systems with public registration, user-generated content, or broad authenticated user access may have higher practical exposure because the flaw depends on user-supplied input.

Exploitation context

The CVE is not listed as KEV in the supplied bundle, and no provided source states active exploitation. Public references include a Mahara forum item, code review, and Launchpad bug, so defenders should assume technical details were publicly discoverable after disclosure.

Researcher notes

Evidence is narrow but consistent: the CVE description names affected branches and fixed versions, and references vendor-controlled Mahara materials. Missing data includes CVSS, CWE, attack prerequisites, affected endpoints, and exploit maturity. Treat endpoint-level exposure as unconfirmed until validated against the vendor bug and patch review.

Mitigation direction

  • Inventory Mahara deployments and identify exact versions.
  • Upgrade 16.10 to 16.10.7 or later.
  • Upgrade 17.04 to 17.04.5 or later.
  • Upgrade 17.10 to 17.10.2 or later.
  • Check Mahara vendor guidance for any branch-specific instructions.
  • Review custom Mahara extensions for unsafe direct request-parameter handling.

Validation and detection

  • Confirm deployed Mahara versions are at or above the fixed releases.
  • Review change records against the linked Mahara review and Launchpad bug.
  • Run existing XSS regression tests in a non-production environment.
  • Check logs for suspicious malformed UTF-8 input around disclosure windows.
  • Verify input handling rejects invalid UTF-8, NULL, and invalid Unicode safely.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2017-17454 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.