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CVE Record

CVE-2026-34429: Vvveb < 1.0.8.1 Stored XSS via Media Upload and Rename

Vvveb prior to 1.0.8.1 contains a stored cross-site scripting vulnerability that allows authenticated users with media upload and rename permissions to execute arbitrary JavaScript by bypassing MIME type validation and renaming uploaded files to executable extensions. Attackers can prepend a GIF89a header to HTML/JavaScript payloads to bypass upload validation, rename the file to .html extension, and execute malicious scripts in an administrator's browser session to create backdoor accounts and upload malicious plugins for remote code execution.

MediumCVSS 5.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Vvveb versions before 1.0.8.1 allow a permitted media user to store malicious browser content that executes when an administrator opens it. This can misuse the administrator’s session to add unauthorized accounts or plugins, potentially escalating to server compromise.

Executive priority

Prioritize prompt remediation on externally reachable or multi-user Vvveb systems. Treat any unexpected administrator or plugin creation as a possible compromise requiring incident response. Lower-risk, tightly controlled installations should still upgrade through normal expedited patching.

Technical view

This is stored cross-site scripting caused by insufficient upload validation and unsafe post-upload renaming. An authenticated user with media upload and rename permissions can make uploaded content pass MIME validation, rename it to a web-executable extension, and trigger JavaScript in an administrator’s browser. Remote code execution is a potential follow-on chain, not the direct vulnerability classification.

Likely exposure

Exposure is concentrated in Vvveb installations before 1.0.8.1 where authenticated users have both media upload and rename permissions. Internet accessibility increases opportunity, but exploitation still requires credentials, specific permissions, and administrator interaction.

Exploitation context

Technical exploit information is publicly referenced, but the bundle reports no CISA KEV listing and provides no evidence of active exploitation. The CVSS 3.1 score is 5.4 because exploitation requires privileges and user interaction, although the documented privilege-escalation chain could produce greater operational impact.

Researcher notes

The core weakness is stored XSS across an upload-and-rename workflow, with changed security scope reflected in the CVSS vector. The bundle identifies a patch commit and fixed release. Its machine-readable affected-version entry is unusual, so confirm exact applicability against the vendor advisory rather than interpreting that entry alone.

Mitigation direction

  • Upgrade Vvveb to version 1.0.8.1 or later following vendor guidance.
  • Until upgraded, remove media upload or rename permissions from untrusted authenticated users.
  • Review administrator accounts and installed plugins for unauthorized additions.
  • Investigate suspicious uploaded web content and preserve relevant evidence before removal.

Validation and detection

  • Inventory Vvveb instances and confirm their installed versions.
  • Identify every account and role possessing media upload and rename permissions.
  • Confirm upgraded systems prevent unsafe uploaded content from becoming browser-executable through renaming.
  • Review media records, administrator accounts, and plugins for unexpected changes.
Prepared
Confidence
high
Sources
6

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.

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-34429 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
5.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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.

2CVSS vectors
3Timeline events
1ADP providers
6Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: noTechnical Impact: partial

CVSS vector scores

2 official scores

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
5.4CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N2.32.7VulnCheck
5.1CVSS 4.0MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N——VulnCheck

Vulnerability scoring details

Base CVSS 4.0 score

5.1Medium
CVSS 4.0 vector shape for CVE-2026-34429Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
givanzVvveb0, cc997d3359ea5e49a45c132f5dee3bc80fb441d7unaffected
Weakness

CWE details

CWE-79

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