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CVE Record

CVE-2021-4309: 01-Scripts 01ACP cross site scripting

A vulnerability, which was classified as problematic, has been found in 01-Scripts 01ACP. This issue affects some unknown processing. The manipulation of the argument $_SERVER['SCRIPT_NAME'] leads to cross site scripting. The attack may be initiated remotely. The identifier of the patch is a16eb7da46ed22bc61067c212635394f2571d3c4. It is recommended to apply a patch to fix this issue. The identifier VDB-217649 was assigned to this vulnerability.

MediumCVSS 4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-4309 is an XSS flaw in 01-Scripts 01ACP. A remote, authenticated attacker could cause script to run in a user’s browser through mishandling of SCRIPT_NAME. The documented impact is page or session integrity risk, not server takeover.

Executive priority

Treat as a moderate remediation item. It is not listed as known exploited, but unpatched administrative web software can expose user sessions and trust in the application interface.

Technical view

The issue is CWE-79 in 01ACP involving manipulation of $_SERVER['SCRIPT_NAME'] in unspecified processing. CVSS v2 is 4.0: AV:N/AC:L/Au:S/C:N/I:P/A:N. A patch commit is identified, but affected versions are not specified.

Likely exposure

Exposure is limited to organizations running 01-Scripts 01ACP, especially unpatched deployments. The source bundle does not provide affected versions, CPEs, deployment paths, or prevalence data, so asset inventory is essential.

Exploitation context

Remote initiation is reported, but authentication is required by the CVSS vector. KEV is false, and the provided sources do not claim active exploitation. Evidence only supports a moderate XSS integrity risk.

Researcher notes

Key gaps are affected version range and exact vulnerable code path. Do not assume broader 01-Scripts products are affected. Validate patch presence and authenticated exposure before escalating severity.

Mitigation direction

  • Apply the vendor patch commit a16eb7da46ed22bc61067c212635394f2571d3c4 where applicable.
  • Check vendor or project guidance for supported fixed releases.
  • Restrict 01ACP administrative access to trusted users and networks.
  • Prioritize replacement if running an unsupported 01ACP deployment.

Validation and detection

  • Inventory systems for 01-Scripts 01ACP deployments.
  • Confirm whether the patch commit is present in deployed code.
  • Review application access controls for authenticated 01ACP areas.
  • Check logs for suspicious authenticated requests around SCRIPT_NAME handling.
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

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 · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookup
cve · low confidence lookup

CVE-2021-4309 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4 (2.0)
Known Exploited
No
Published

Vector: AV:N/AC:L/Au:S/C:N/I:P/A:N

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.

1CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
4CVSS 2.0MediumAV:N/AC:L/Au:S/C:N/I:P/A:N82.9Primary CVE score

Vulnerability scoring details

Base CVSS 2.0 score

4Medium
CVSS 2.0 vector shape for CVE-2021-4309Access VectorAccess ComplexityAuthenticationConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: AV:N/AC:L/Au:S/C:N/I:P/A:N

Access Vector
NetworkAdjacentLocal
Access Complexity
LowMediumHigh
Authentication
NoneSingleMultiple
Confidentiality Impact
CompletePartialNone
Integrity Impact
CompletePartialNone
Availability Impact
CompletePartialNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
01-Scripts01ACPn/aListed
Weakness

CWE details

CWE-79

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