CVE-2026-34429Public exploitNetwork attack vector

Stored XSS via HTML media rename

Published Apr 20, 2026 · Updated Apr 20, 2026

Stored XSS in Vvveb before 1.0.8.1 allows remote authenticated users to execute JavaScript through a renamed media upload. The media trait trusts a GIF-signature MIME result, then permits the payload to be renamed with an .html extension and served from the application origin. Media upload and rename permission plus an administrator opening the file are required; the script can act in that administrator's browser session.

CVSS severity5.1
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Vvveb before 1.0.8.1 allows remote authenticated users to execute JavaScript through a renamed media upload. The media trait trusts a GIF-signature MIME result, then permits the payload to be renamed with an .html extension and served from the application origin. Media upload and rename permission plus an administrator opening the file are required; the script can act in that administrator's browser session.

The record

CVE
CVE-2026-34429
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
givanz
Product
Vvveb
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.0.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

givanz · Vvvebversion=0 <1.0.8.1

Published CVSS scores

5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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