CVE-2026-16573Network attack vector

Unauthenticated stored XSS via unsanitized SVG signatures

Published Aug 5, 2026 · Updated Aug 5, 2026

Stored XSS in Bit Apps Bit Form before 3.2.0 allows remote attackers to execute JavaScript through an uploaded SVG signature image. The plugin stores the submitted signature image without sanitizing embedded SVG script content, which runs when the file is viewed. Exploitation requires a form with the Signature field and a user to view the stored file; the script executes in that viewer's browser context.

CVSS severity7.5
High
EPSS probability0.27%
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 Bit Apps Bit Form before 3.2.0 allows remote attackers to execute JavaScript through an uploaded SVG signature image. The plugin stores the submitted signature image without sanitizing embedded SVG script content, which runs when the file is viewed. Exploitation requires a form with the Signature field and a user to view the stored file; the script executes in that viewer's browser context.

The record

CVE
CVE-2026-16573
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
Bit Apps
Product
Bit Form
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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 <3.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Bit Apps · Bit Formversion=0 <3.2.0

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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